The Nernst Electric Lamp.—Prof. Walter Nernst, of the University of GÖttingen, has recently devised an electric lamp which promises to be an important addition to our present methods of lighting. The part of the lamp which emits the light consists of a small rod of highly refractory material, said to be chiefly thoria, which is supported between two platinum electrodes. The rod is practically a nonconductor when cold, but by heating it (in the smaller sizes a match is sufficient) its conductivity is so raised that a current will pass through it; after the current is once started the heat produced by the resistance of the rod is sufficient to keep up its conductivity, and the latter is raised to a state of intense incandescence, and gives out a brilliant white light. As the preliminary heating by means of a match or other flame would in some cases be an inconvenience, Professor Nernst has devised a lamp which, by means of a platinum resistance attachment, can be started by simply turning a switch. The life of the rods is about five hundred hours. The lamps are said to work equally well with either alternating or direct currents, and there is no vacuum necessary. If this lamp proves a success as a commercial apparatus, it will be but another example of how slight a matter may make all the difference between success and failure. There have been numerous experimenters trying for the last ten years, and in fact ever since the appearance of the arc lamp, to utilize in an electric lamp the great light-giving power of the refractory earths in a state of incandescence; but, owing to their high resistance at ordinary temperatures, no results were obtained until Professor Nernst thought of heating his thoria rod, and this simple procedure seems to have solved the whole difficulty. It is claimed that the Nernst lamp is a much more economical transformer of electricity into light than the present incandescent electric lamps. An apparatus called a kaolin candle, which has been suggested as an anticipation of Professor Nernst's lamp, was constructed by Paul Jablochkoff in 1877 or 1878. It consisted of a strip of kaolin, along which ran a "match" of some conducting material. The current was passed through this "match" until the kaolin strip became heated sufficiently to become a conductor itself. The lamp did not, however, prove a commercial success.

Laws of Climatic Evolution.—The problem of the laws of climatic evolution was characterized by Dr. Marsden Manson, in a paper read at the British Association, as one of the grandest and most far-reaching problems in geological physics, since it embraces principles and laws applicable to other planets than ours. After presenting a formulation of those laws, the author pointed out that in consequence of their working, a hot spheroid rotating in space and revolving about a central sun, and holding fluids of similar properties to water and air within the sphere of its control, must pass through a series of uniform climates at sea level, gradually decreasing in temperature and terminating in an ice age, and that this age must be succeeded by a series of zonal climates gradually increasing in temperature and extent. The conclusions thus reached were that in the case of the earth zonal distribution of climates was inaugurated at the culmination of the ice age, and is gradually increasing in temperature and extent by the trapping of the solar energy in the lower atmosphere, and that the rise has a moderate limit; that the ice age was unique and due to the physical properties of water and air, and to the difference in specific heat of land and water; and that prior to the ice age local formation of glaciers could occur at any latitude and period. Dr. Manson then observed that Jupiter was apparently in a condition through which the earth has already passed, and Mars was in one toward which the climatic evolution of the earth was tending.

Poisonous Plants.—Statistics in regard to poisonous plants are lacking on account of a general ignorance of the subject, and it is therefore impossible to form even an approximate estimate of the damage done by them. Besides the criminal uses that may be made of them, there are some other problems connected with them that are of general public interest. The common law of England holds those who possess and cultivate such plants responsible for damages accruing from them; and a New York court has awarded damages in a case of injury from poison ivy growing in a cemetery. In order to obtain information on the subject, the botanical division of the Department of Agriculture arranged to receive notices through the clipping bureaus of the cases of poisoning recorded in the newspapers. Thus through the persons named in the articles or through the local postmaster it was put in correspondence with the physician in the case, who furnished the authentic facts. A large number of correct and valuable data were thus secured. It is proved by these facts that all poisonous plants are not equally injurious to all persons nor to all forms of life. Thus poison ivy has no apparent external effect upon animals, and a few of them eat its leaves with impunity; and it acts upon the skin of the majority of persons with varying intensity—on some hardly at all, while others are extremely sensitive to it. A similar variability is found in the effects of poisonous plants taken internally. In some cases often regarded as of that kind, death is attributable not to any poison which the plant contains, but to immoderate or incautious eating, or to mechanical injury such as is produced in horses by the hairs of crimson clover, or to the effect of parasitic growths, such as ergot on rye. Excluding all which operate in these ways, there are, however, a large number of really poisonous plants, the properties of which are comparatively unknown. It is concerning these that information has been sought by the botanical division. Its report contains descriptions of about forty plants, with figures, belonging to seventeen families.

The United States Biological Survey.—The Biological Survey of the United States Department of Agriculture aims to define and map the agricultural belts of the country in order to ascertain what products of the soil can and what can not be grown successfully in each, to guide the farmer in the intelligent introduction of foreign crops, and to point out his friends and his enemies among the native birds and animals. For information on these subjects so important to him the farmer has had to rely on his own experiments or those of his neighbors, often carried on at enormous cost to persons little able to bear it. The Survey and its predecessor, the division of ornithology and mammology, have had small parties in the field traversing the public domain for the purpose of studying the geographic distribution of our native land animals and plants and mapping the boundaries of the areas they inhabit. It was early learned that North America is divisible into seven transcontinental belts or life zones and a much larger number of minor areas or faunas, each characterized by particular associations of animals and plants. The inference was natural and has been verified that these same zones and areas, up to the northern limit of profitable agriculture, are adapted to the needs of particular kinds or varieties of cultivated crops. The Survey is engaged in tracing as precisely as possible the actual boundaries of these belts and areas, and in finding out and designating the varieties of crops best adapted to each. In this undertaking it aims to point out such exotic products as, from their importance in other lands, are likely to prove of value if introduced on fit soils and under proper climatic conditions. The importance of this work will be realized when it is recollected that all the climatic life zones of the world, except the hottest tropical, are represented in our country. The colored maps prepared by the Survey furnish the best guide the farmer can have for judging what crops will be best adapted for his particular region; and in connection with the work of the entomologist, show the belts along which noxious insects are likely to spread. The report of the Survey, prepared under the direction of its chief, C. Hart Merriam, though full of valuable information not before presented consecutively, is preliminary and only touches the edge of a subject which is susceptible of copious elaboration, and is destined to be worked up with immense profit.

A Neolithic Lake Dwelling.—A crannog, or lake dwelling, discovered in the summer of 1898 on the banks of the Clyde, has received much attention from English archÆologists because of its unique situation on a tidal stream, and of its being apparently neolithic or far more ancient than any other crannog yet examined, in all others the relics being of the bronze age. Careful excavations have been made in it and are still in progress, and the refuse mound of the former settlement has been sifted, with results that have made it plain that there were design and execution in the building, and that it was occupied and inhabited for a long period. Positive evidence of fire is afforded in the shape of numerous firestones and calcined embers, and indications of the condition of life at the period are given by the implements, ornaments, and tools recovered. The crannog is about sixteen hundred yards east of the Castle Rock of Dumbarton, and about fifty yards from the river at low tide, but is submerged when the tide is in to a depth of from three to twelve feet, and is one hundred and eighty-four feet in circuit. The piles in the outer circle are of oak, which below the mud surface is still quite fresh. The transverse beams and pavement inside are of wood of the consistence of cheese—willow, alder, and oak—while the smaller branches are of fir, birch, and hazel, with bracken, moss, and chips. The stones in the outer circle and along the causeway leading to the dwelling place seem to have been set in a methodical order, most of the bowlders being about a lift for a man. The refuse mound extends for about twelve feet outside for the greater part of the circuit, and here most of the bone and flint implements have been discovered. The largest article found in the site was a very fine canoe, thirty-seven feet long and forty inches beam, dug out of a single oak tree, which lay in what has proved to have been a dock. A curious ladder was also found here, the rungs of which were cut out of the solid wood, and which has somewhat the general appearance of a post of a post-and-rail fence. The exploration of the site is much interfered with by the rising of the tide, which covers the crannog for a considerable time every day. All the relics found—consisting chiefly of objects of bone, staghorn, jet, chert, and cannel coal, with some querns, the canoe, ladder, etc.—have been placed in the museum at Glasgow.

Portland Cement.—The following facts are taken from an address delivered before the Franklin Institute by Mr. Robert W. Lesley: "It was not until the end of the last century that the true principles of hydraulic cement were discovered by Smeaton, who, in the construction of the Eddystone Lighthouse, made a number of experiments with the English limestones, and laid down, as a result, the principle that a limestone yielding from fifteen to twenty-five per cent of residue when dissolved in hydrochloric acid will set under water. These limestones he denominated hydraulic limestones, and from the principle so laid down by him come the two great definitions of what we now know as cement, namely, the natural and artificial cements of commerce. The natural variety, such as the Rosendale, Lehigh, and Cumberland cements, was first made by Joseph Parker in 1796, who discovered what he called 'Roman cement,' based upon the calcination at low temperatures of the nodules found in the septaria geological formation in England. This was practically the first cement of commerce, and gave excellent results. Joseph Aspdin, a bricklayer or plasterer, took out a patent in England in 1824 on a high-grade artificial cement, and, at great personal deprivation, succeeded in manufacturing it on a commercial scale by combining English chalks with clay from the river beds, drying the mixed paste, and after calcining at high heat the material thus produced, grinding it to powder. This cement, which was the first Portland cement in the market, obtained its name from its resemblance when it became stone to the celebrated Portland stone, one of the leading building materials in England. The rocks used in the manufacture of Portland cement are very similar to those from which natural cement is made. The various layers in the natural rock may vary in size or stratification, so that the lime, alumina, and silica may not be in position to combine under heat, or there may be too much of one ingredient, or not enough of the others in close proximity to each other. In making Portland cement, these rocks, properly proportioned, are accordingly ground to an impalpable powder, the natural rock being broken down and the laminÆ distributed in many small grains. This powder is then mixed with water, and is made into a new stone in the shape of the brick, or block, in which all the small grains formerly composing the laminÆ of the original rock are distributed and brought into a close mechanical juxtaposition to each other. The new rock thus made is put into kilns with layers of coke, and is then calcined at temperatures from 1,600° to 1,800°. The clinker, as it comes from the kiln, is then crushed and ground to an impalpable powder, which is the Portland cement of commerce. Portland cement may be made from other materials, such as chalk and clay, limestone and clay, cement rock and limestone, and marls and clays. In every case the principle is the same, the breaking down and the redistributing of the materials so that the fine particles may be in close mechanical union when subjected to the heat of the kiln."

The French Nontoxic Matches.—It is believed, by Frenchmen at least, that the problem long sought, of finding a composition for a match head in which all the advantages of white phosphorus shall be preserved while its deleterious qualities are eliminated or greatly reduced, has been solved in the new matches which the French Government has placed upon the market. These matches are marked S. C., by the initials of the inventors, MM. SÉvÈne and Cahen, are made in the factories at TrÉlazÉ, Begles, and Samtines, and have been well received by the public. In preparing the composition, the chlorate of potash of the old flashing and safety matches has been retained, and the sesquisulphide of phosphorus is used instead of the white or red phosphorus of the old matches. The latter substance, besides the indispensable qualities of fixity and resistance to atmospheric influences, has the two important properties of inflaming at 95° C., much nearer the igniting point of white phosphorus (60° C.) than of red (260° C.), and being therefore easier to light; and of having a low latent or specific heat. With these properties embodied in the inflammable composition of the head, the new match is expected to be comparatively free from accidental explosions during manufacture and export, to take fire by friction, and to burn steadily and regularly. The expectation has so far been fulfilled. The phosphorus compound has a special odor, in which the sulphur characteristic predominates, but, not boiling under 380° C., does not become offensive in the shops; and the match heads made with it do not emit the phosphorescence which is often exhibited by matches made with white phosphorus. It is only feebly toxic by direct absorption, experiments on guinea pigs indicating that it is only about one tenth as much so as white phosphorus.

Trees as Land Formers.—John Gifford, in a paper presented to the Franklin Institute on Forestry in Relation to Physical Geography and Engineering, mentions as illustrating the way forests counteract certain destructive forces, the mangrove tree as "the great land former which, supplementing the work of the coral polyp, has added to the warm seashore regions of the globe immense areas of land." The trees grow in salt water several feet deep, where their labyrinth of roots and branches collect and hold sediment and flotage. Thus the shore line advances. The seeds, germinating on the plant, the plantlets fall into the water, float away till their roots touch the bottom, and there form the nucleus of new islands and life. The forest constantly improves the soil, provided the latter is not removed or allowed to burn. The roots of trees penetrate to its deeper layers and absorb great quantities of mineral matters, a large percentage of which goes to the leaves, and is ultimately deposited on the surface. "The surface soil is both enriched by these mineral substances and protected by a mulch of humus in varying stages of decomposition. As the lower layers rot, new layers of leaves and twigs are being constantly deposited, so that the forest soil, in the course of time, fairly reeks with nourishing plant food, which seeps out more or less to enrich neighboring soils." The forest is also a soil former. "Even the most tender rootlet, because of its acidity, is able to dissolve its way through certain kinds of rock. This, together with the acids formed in the decomposition of humus, is a potent and speedy agent in the production of soil. The roots of many species of trees have no difficulty whatever in penetrating limestone and in disintegrating rocks of the granitic series. As the rock crumbles, solid inorganic materials are released, which enrich neighboring soils, especially those of the valleys in regions where the forest is relegated to the mountain sides and top, as should be the case in all mountainous regions. In view of the destruction caused by mankind, it is a consoling fact that Nature, although slowly, is gradually improving her waste lands. If not interrupted, the barest rock and the fallowest field, under conditions which may be called unfavorable, will become, in course of time, forest-clad and fertile. The most important function of the forest in relation to the soil, however, is in holding it in place and protecting it from the erosive action of wind and rain."

The Atlantic Slope.—The Atlantic slope of the United States is described in the New Jersey State Geological Survey's report on the Physical Geography of the State as "a fairly distinct geographical province. Its eastern boundary is the sea; its western boundary on the north is the divide between the drainage flowing southeast to the sea and that flowing northeast to the St. Lawrence. Farther south its western limit is the divide between the streams flowing east to the Atlantic and those flowing west to the Ohio and Mississippi Rivers." The line between it and the geographical province next west follows the watershed of the Appalachian system of mountains. It is divided, according to elevations, into several subprovinces, all of which elongate in a direction roughly parallel to the shore. Next to the coast there is usually a belt of lowland, few or many miles wide, called the Coastal Plain. Inland from the Coastal Plain is an intermediate height, between the Coastal Plain to the east and the mountains to the west, known in the South as the Piedmont Plateau. The mountainous part of the slope constitutes the third province, known as the Appalachian Zone. The Atlantic slope may be divided into two sections—a northern and a southern—in which the Coastal Plain is narrow and wide respectively. These two sections meet in New Jersey, where the division runs from the Raritan River, just below New Brunswick, to Trenton. South of this line the Coastal Plain expands, and all considerable elevations recede correspondingly from the shore. These three subprovinces are especially well shown in the southern section of the Atlantic slope. They are less well developed in the northern section, and even where the topography is comparable the underlying rock structure is different. In New Jersey a fourth belt, the Triassic formation, is interposed between the Coastal Plain and the Highlands corresponding to the Piedmont Plateau. North of New Jersey the Coastal Plain has little development, though Long Island and some small areas farther east and northeast are to be looked upon as parts of it.

American Fresh-water Pearls.—The facts cited by Mr. George F. Kunz in his paper, published in the Report of the United States Fish Commission, on the Fresh-water Pearls and Pearl Fisheries of the United States, give considerable importance to this feature of our natural history. The mound explorations attest that fresh-water pearls were gathered and used by the prehistoric peoples of the country "to an extent that is astonishing. On the hearths of some of these mounds in Ohio the pearls have been found, not by hundreds, but by thousands and even by bushels—now, of course, damaged and half decomposed by centuries of burial and by the heat of superficial fires." The narratives of the early Spanish explorers make several mentions of pearls in the possession of the Indians. For a considerable period after the first explorations, however, American pearls attracted but little attention, and "for some two centuries the Unios [or 'fresh-water mussels'] lived and multiplied in the rivers and streams, unmolested by either the native tribes that had used them for food, or by the pioneers of the new race that had not yet learned of their hidden treasures." Within recent years the gathering of Unio pearls has attained such importance as to start economical problems warranting and even demanding careful and detailed inquiry. The first really important discovery of Unio pearls was made near Paterson, N. J., in 1857, in the form of the "queen pearl" of fine luster, weighing ninety-three grains, which was sold to EugÉnie, wife of Napoleon III, for twenty-five hundred dollars, and is now worth four times that amount. As a result the Unios at Notch Brook, where it was found, were gathered by the million and destroyed. Within a year fully fifteen thousand dollars' worth of pearls were sent to the New York market. Then the shipments gradually fell off. Some of the best American pearls that were next found were at Waynesville, Ohio, where Mr. Israel H. Harris formed an exceedingly fine collection. It contained more than two thousand specimens, weighing more than as many grains. Among them were one button-shaped on the back and weighing thirty-eight grains, several almost transparent pink ones, and one showing where the pearl had grown almost entirely through the Unio. In 1889 a number of magnificently colored pearls were found at different places in the creeks and rivers of Wisconsin, of which more than ten thousand dollars' worth were sent to New York within three months. These discoveries led to immense activity in pearl hunting through all the streams of the region, and in three or four seasons the shells were nearly exhausted. The pearl fisheries of this State have produced at least two hundred and fifty thousand dollars' worth of pearls since 1889. Another outbreak of the "pearl mania" occurred in Arkansas in 1897, and extended into the Indian Territory, Missouri, Georgia, and other States.

Distribution of Cereals in the United States.—To inquiries made preparatory to drawing up a report on the Distribution of Cereals in North America (Department of Agriculture, Biological Survey), Mr. C. S. Plumb received one thousand and thirty-three answers, eight hundred and ninety-seven of which came from the United States and the rest from the Canadian provinces. These reports showed that in many localities, particularly in the East and South, but little attention is paid to keeping varieties pure, and many farmers use mixed, unknown, or local varieties of ordinary merit for seed. In New England but little grain is grown from sowing, owing to the cheapness of Western grain, and wheat is rarely reported. Oats are now mostly sown from Western seed, and the resulting crop is mown for hay, while most of the corn is cut for green fodder or silage. On certain fine lowlands—as, for example, in the Connecticut Valley—oats, and more especially corn, are often grown for grain. While reports on most of the cereals were rendered from the lower austral zone, or the region south of the Appalachians and the old Missouri Compromise line, this region, except where it merges with the upper austral or the one north of it, is apparently outside the area of profitable cultivation of wheat and oats. In Louisiana and most of the other parts of the lower austral, except in northern Texas and Oklahoma, wheat is almost an unknown crop. The warm, moist climatic conditions here favor the development of fungous diseases to such a degree that the plants are usually ruined or greatly injured at an early stage of growth. In Florida, as a rule, cereals are rarely cultivated except on the uplands at the northern end of the State. In a general way, corn and wheat are most successfully grown in the upper austral zone, or central States, while oats are best and most productive in the transition zone (or northern and Lake States and the Dakotas), or along the border of the upper austral and transition. The gradual acclimation of varieties of cereals, through years of selection and cultivation, has gone so far, however, that some varieties are now much better adapted to one zone than to another.

Spanish Silkworm Gut.—The business of manufacturing silkworm gut in Spain is a considerable industry. The method of preparation is thus described in the Journal of the Society of Arts: After the silkworm grub has eaten enough mulberry leaves, and before it begins to spin, which is during the months of May and June, it is thrown into vinegar for several hours. The insect is killed and the substance which the grub, if alive, would have spun into a cocoon is drawn out from the dead worm into a much thicker and shorter silken thread, in which operation considerable dexterity and experience are required. Two thick threads from each grub are placed for about four hours in clear cold water, after which they are put for ten or fifteen minutes in a solution of some caustic. This loosens a fine outer skin on the threads, which is removed by the hands, the workman holding the threads in his teeth. The silk is then hung up to dry in a shady place, the sun rendering it brittle. In some parts of the country these silk guts are bleached with sulphur vapor, which makes them beautifully glossy and snow-white, while those naturally dried have a yellowish tint. The quality of the gut is decided according to the healthy condition of the worm, round indicating a good quality and flat an inferior one.

The Nests of Burrowing Bees.—Prof. John B. Smith, having explained to his section of the American Association a method which has been successfully applied, of taking casts in plaster of Paris of the homes of burrowing insects, with their branchings, to the depth of six feet, described some of the results of its application. Bees, of the genus Calletes, dig vertically to the depth of eighteen inches or more, then burrow horizontally from two to five inches farther, and construct a thin, parchmentlike cell of saliva, in which the egg is deposited, with pollen and honey for the food of the larva. They then start a new horizontal burrow a little distance from the first, and perhaps a third, but no more. The vertical tubes are then filled up, so that when the bees come to life they must burrow from six to twenty-four inches before they can reach the surface. Another genus makes a twisted burrow; another makes a vertical burrow that may be six feet deep. About a foot below the surface it sends off a lateral branch, and in this it excavates a chamber from one to two and a half inches in diameter. Tubes are sent down from this chamber, as many perhaps as from six to twenty together, and these are lined with clay to make them water-tight. This bee, when it begins its burrow, makes an oblique gallery from four to six inches long before it starts in the vertical direction, and all the dirt is carried through this oblique gallery. Then the insect continues the tube vertically upward to just below the surface, and makes a small concealed opening to it here, taking care to pile no sand near it. This is the regular entrance to the burrow.

MINOR PARAGRAPHS.

In a report of an inspection of three French match factories, published as a British Parliamentary paper, Dr. T. Oliver records as his impressions and deductions that while until recently the match makers suffered severely from phosphorus poisoning, there is now apparently a reduction in the severe forms of the illness; that this reduction is attributable to greater care in the selection of the work people, to raising the age of admission into the factory, to medical examination on entrance, subsequent close supervision, and repeated dental examination; to personal cleanliness on the part of the workers; to early suspension on the appearance of symptoms of ill health; and to improved methods of manufacture. The French Government is furthering by all possible means new methods of manufacture in the hope of finding a safer one; and a match free from white phosphorus and still capable of striking anywhere is already manufactured.

A mechanical and engineering section is to be organized in the Franklin Institute, Philadelphia, to be devoted to the consideration of subjects bearing upon the mechanic arts and the engineering problems connected therewith. The growth of the various departments of this institution—which has been fitly termed a "democratic learned society," from the close affiliation in it of the men of the professions and the men of the workshops—by natural accretion, and the steadily growing demands for the extension of its educational work during the past decade, have increased the costs for maintenance and administration and have been the cause of a deficit in nearly every year. A movement is now on foot, approved by the board of managers, and directed by a special committee, to secure for it an endowment, toward which a number of subscriptions ranging from two hundred and fifty to twenty-five hundred dollars have already been received.

The earthquake which took place in Assam, June 12, 1897, was described by Mr. R. D. Oldham in the British Association as having been the most violent of which there is any record. The shock was sensible over an area of 1,750,000 square miles, and if it had occurred in England, not a house would have been left standing between Manchester and London. Landslips on an unprecedented scale were produced, a number of lakes were formed, and mountain peaks were moved vertically and horizontally. Monuments of solid stone and forest trees were broken across. Bridges were overthrown, displaced, and in some places thrust bodily up to a height of about twenty feet, and the rails on the railroads were twisted and bent. Earth fissures were formed over an area larger than the United Kingdom, and sand rents, from which sand and water were forced in solid streams to a height of three or four feet above the ground, were opened "in incalculable numbers." The loss of life was comparatively small, as the earthquake occurred about five o'clock in the afternoon, and the damage done was reduced by the fact that there were no large cities within the area of greatest violence; but in extent and capacity of destruction, as distinguished from destruction actually accomplished, this earthquake surpassed any of which there was historical mention, not even excepting the great earthquake of Lisbon in 1755.

The first section of the electric railway up the Jungfrau, which is intended to reach the top of the mountain, was opened about the first of October, 1898. The line starts from the Little Scheidegg station of the existing Wengern Alp Railway, 6,770 feet above the sea, and ascends the mountain masses from the north side, passing the Eiger Glacier, Eiger Wand, Eismeer, and Jungfraujoch stations, to Lift, 13,430 feet, whence the ascent is completed by elevator to the summit, 13,670 feet. The road starts on a gradient of ten per cent, which is increased to twenty per cent about halfway to the Eiger Glacier station, and to twenty-five per cent, the steepest, after passing that station. There are about 85 yards in tunnel on the section now opened, but beyond the Eiger Glacier the road will not touch the surface except at the stations. About 250 yards of the long tunnel have been excavated so far. The stations beyond Eiger Wand will be built within the rock, and will be furnished with restaurants and beds. At the Eiger Wand and Eismeer stations passengers will contemplate the view through windows or balconies from the inside; but at the Jungfraujoch station tourists will be able to go out and take sledges for the great Aletsch Glacier. The cars will accommodate forty passengers each, and the company expects to complete the railroad by 1904.

Alexander A. Lawes, civil engineer, of Sydney, Australia, suggests a plan of mechanical flight on beating wings as presenting advantages that transcend all other schemes. He believes that the amount of power required to operate wings and the difficulty in applying it are exaggerated beyond all measure. The wings or sustainers of the bird in flight, he urges, are held in the outstretched position without any exertion on its part; and many birds, like the albatross, sustain themselves for days at a stretch. "This constitutes its aËrial support, and is analogous to the support derived by other animals from land and water." The sole work done by the bird is propulsion and elevation by the beating action of the wings. Mr. Adams's machine, which he does not say he has tried, is built in conformity to this principle, and its sails are modeled as nearly as possible in form and as to action with those of the bird. The aid of an air cylinder is further called in, through which a pressure is exerted balancing the wings. The wings are moved by treadles, and the author's picture of the aËronaut looks like a man riding an aËrial bicycle.

Carborundum, a substance highly extolled by its manufacturers as an abrasive, is composed of carbon and silicon in atomic proportions—thirty parts by weight of carbon and seventy of silicon. It is represented as being next to the diamond in hardness and as cutting emery and corundum with ease, but as not as tough as the diamond. It is a little more than one and a fifth times the weight of sand, is infusible at the highest attainable heat, but is decomposed in the electric arc, and is insoluble in any of the ordinary solvents, water, oils, and acids, even hydrofluoric acid having no effect upon it. Pure carborundum is white. In the commercial manufacture the crystals are produced in many colors and shades, partly as the result of impurities and partly by surface oxidation. The prevailing colors are green, black, and blue. The color has no effect upon the hardness. Crude carborundum, as taken from the furnace, usually consists of large masses or aggregations of crystals, which are frequently very beautifully colored and of adamantine luster.

A peculiarity of Old English literary usage is pointed out by Prof. Dr. L. Kellner, of Vienna, as illustrated in a sentence like "the mob is ignorant, and they are often cruel." This is considered a bad solecism in modern English, but in Old and Middle English constructions of exactly the same kind are so often met with that it is impossible to account for them as slips and mistakes. They may be brought under several heads, as, Number (the same collective noun used as a singular and a plural); Case (the same verb or adjective governing the genitive and accusative, the genitive and dative, or the dative and accusative); Pronoun ("thou" and "ye" used in addressing the same person); Tense (past and perfect, or past and historical present used in the same breath); Mood (indicative and subjunctive used in the same clause). Finite verb and infinitive dependent on the same verb; simple and prepositional infinitives dependent on the same verb; infinitive and verbal noun used side by side; different prepositions dependent on the same verb, like Caxton's "He was eaten by bears and of lions"; direct and indirect speech alternating in the same clause. These facts, which are met with as late as 1611 (Bible, authorized version), point to the conclusion that what to us appears as a grammatical inconsistency was once considered a welcome break in the monotony of construction.

Mr. Fischer Sigwart is quoted in the Revue Scientifique as having studied the life of frogs for thirty years, and found that they are night wanderers, keeping comparatively quiet during the day and seeking their prey after dark. In the fall they leave their hunting grounds in the fields and woods and take refuge near swamps and ponds, passing the winter in the banks of rivers or the mud in the bottoms of ponds, whence they come out in the spring, when the process of reproduction begins. The frog is not sexually mature till it is four or five years old. The coupling process lasts from three to thirty days. Between its spring wakening and spawning the frog eats nothing except, perhaps, its own skin, which it moults periodically. After spawning, frogs leave the water and go to the fields and woods. They can be fed, when kept captive, upon insects and earthworms.

NOTES.

A relation has been discovered by Professor Dolbear and Carl A. and Edward A. Bessey between the chirping of crickets and the temperature, the chirps increasing as frequently as the temperature rises. The Besseys relate, in The American Naturalist, that when, one cool evening, a cricket was caught and brought into a warm room, it began in a few minutes to chirp nearly twice as rapidly as the out-of-door crickets, and that its rate very nearly conformed to the observed rate maintained other evenings out of doors under the same temperature conditions.

C. Drieberg, of Colombo, Ceylon, records, in Nature, a rainfall at Nedunkeni, in the northern province of Ceylon, December 15 and 16, 1897, of 31.76 inches in twenty-four hours. The highest previous records, as cited by him, are at Joyeuse, France, 31.17 inches in twenty-two hours; Genoa, 30 inches in twenty-six hours; on the hills above Bombay, 24 inches in one night; and on the Khasia Hills, India, 30 inches in each of five successive days. The average annual rainfall at Nedunkeni has been 64.70 inches, but in 1897 the total amount was 121.85 inches. The greatest annual rainfall is on the Khasia Hills, India, with 600 inches. The wettest station in Ceylon is Padupola, in the central province, with 230.85 inches as the mean of twenty-six years, but in 1897 the amount was 243.07 inches.

The Korean postage stamps are printed in the United States. As explained in the United States consular reports, they are of four denominations, and all alike except in color and denomination. Of the inscriptions, the characters on the top are ancient Chinese, and those at the bottom, having the same meaning, are Korean; the characters on the right are Korean and those on the left are Chinese, both giving the denominations, with the English translation just below the center of the stamp. The plum blossom in each corner is the royal flower of the present Ye dynasty, which has been in existence more than five hundred years, and the figures at the corners of the center piece represent the four spirits that stand at the corners of the earth and support it on their shoulders. The national emblem in the center is an ancient Chinese phallic device.

A paragraph in La Nature calls to mind that the year 1898 was the "jubilee" of the sea serpent, the first mention of a sight of the monster—whether fabulous or not is still undecided—having been made by the captain and officers of the British ship DÆdalus in 1848. They said they saw it between the Cape of Good Hope and St. Helena, and that it was about six hundred feet long. Since then views of sea serpents have been reported nearly every year, but none has ever been caught or seen so near or for so long a time as to be positively identified. There are several creatures of the deep which, seen for an instant, might be mistaken with the aid of an excited imagination for a marine serpent; and it is not wholly impossible that some descendants of the gigantic saurians of old may still be living in the ocean undetected by science.

The results of a study of the winter food of the chickadee by Clarence M. Weed, of the New Hampshire College Agricultural Experiment Station, shows that more than half of it consists of insects, a very large proportion of which are taken in the form of eggs. Vegetation of various sorts made up a little less than a quarter of the food; but two thirds of this consisted of buds and bud scales that were accidentally introduced along with plant-lice eggs. These eggs made up more than one fifth of the entire food, and formed the most remarkable element of the bill of fare. The destruction of these eggs of plant lice is probably the most important service which the chickadee renders during its winter residence. Insect eggs of many other kinds were found in the food, among them those of the tent caterpillar and the fall cankerworm, and the larvÆ of several kinds of moths, including those of the common apple worm.

The Merchants' Association of San Francisco has been trying the experiment of sprinkling a street with sea water, and finds that such water binds the dirt together between the paving stones, so that when it is dry no loose dust is formed to be raised by the wind; that sea water does not dry so quickly as fresh water, so that it has been claimed when salt water has been used that one load of it is equal to three loads of fresh water. The salt water which is deposited on the street absorbs moisture from the air during the night, whereby the street is thoroughly moist during the early morning, and has the appearance of having been freshly sprinkled.

The Tarahumare people, who live in the most inaccessible part of northern Mexico, were described by Dr. Krauss in the British Association as ignorant and primitive, and many still living in caves. What villages they have are at altitudes of about eight thousand feet above the sea level. They are a small and wiry people, with great powers of endurance. Their only food is pinoli, or maize, parched and ground. They have a peculiar drink, called teshuin, also produced from maize and manufactured with considerable ceremony, which tastes like a mixture of sour milk and turpentine. Their language is limited to about three hundred words. Their imperfect knowledge of numbers renders them unable to count beyond ten. Their religion seems to be a distorted and imperfect conception of Christian traditions, mixed with some of their own ideas and superstitions.

The directory of the School of Anthropology of Paris, which consists chiefly of the professors in the institution, has chosen Dr. Capitan, professor of pathological anthropology, to succeed M. Gabriel de Mortillet, deceased, as professor of prehistoric anthropology. Dr. Capitan's former chair is suppressed.

The highest cog-wheel railroad in Europe and probably in the world is the one from Zermatt, Switzerland, to the summit of the GÖrner Grat, upward of eleven thousand five hundred feet above the sea. It is between five and six miles long, and rises nearly fifty-two hundred feet, with a maximum grade of twenty per cent. There are two intermediate stations, at the Riffel Alp and the Riffelberg, and the ascent is made in ninety minutes. The height of this road will be surpassed by that of the one now being erected up the Jungfrau.

Extraordinary advantages are claimed by Mrs. Theodore R. MacClure, of the State Board of Health, for Michigan as a summer and health-resort State. The State has more than sixteen hundred miles of lake line, the greater part of which is or can be utilized for summer-resort purposes; there are in its limits 5,173 inland lakes varying in size and having a total area of 712,864 square acres of water. The many rivers running through the State furnish on their banks delightful places for camping and for recreation.

An action of bacteria on photographic plates was described by Prof. P. P. Frankland at the last meeting of the British Association. Ordinary bacterial cultures in gelatin and agar-agar are found to be capable of affecting the photographic film even at a distance of half an inch, while, when they are placed in contact with the film, definite pictures of the bacterial growths can be obtained. The action does not take place through glass, and therefore, as in the case of Dr. W. J. Russell's observations with some other substances, it is considered probably due to the evolution of volatile chemical materials which react with the sensitive film. Many varieties of bacteria exert the action, but to a different degree. Bacterial growths which are luminous in the dark are much more active than the non-luminous bacteria hitherto tried.

Telephonic communication, it is said, has been established between a number of farms in Australia by means of wire fences. A correspondent of the Australian Agriculturist from a station near Colmar represents that it is easy to converse with a station eight miles distant by means of instruments connected on the wire fences, and that the same kind of communication has been established over a distance of eight miles. Several stations are connected in this way.

We have to record the deaths of F. A. Obach, electrical engineer, at GrÄtz, Austria, December 27th, aged forty-six years. He was author of numerous papers on subjects of electrical science in English and German publications, and of lectures on the chemistry of India rubber and gutta percha; Dr. Reinhold Ehret, seismologist and author of books on earthquakes and seismometers, who died from an Alpine accident in the Susten Pass; Dr. Joseph Coats, professor of pathology at the University of Glasgow, and author of a manual of pathology, a work on tuberculosis, etc.; Thomas Hincks, F. R. S., author of books on marine zoÖlogy, February 2d; Major J. Hotchkiss, president in 1895 of the Geological Section of the American Association and author of papers on economic geology and engineering; Wilbur Wilson Thoburn, professor of biomechanics at Leland Stanford Junior University; Dr. Giuseppe Gibelli, professor of botany in the University of Turin; Dr. G. WolffhÜzel, professor of hygiene in the University of GÖttingen; Dr. Dareste de Chavannes, author of researches in animal teratology, and formerly president of the French Society of Anthropology; Dr. Rupert BÖck, professor of mechanics in the Technical Institute of Vienna; William Colenso, F. R. S., of New Zealand, naturalist and author of investigations of Maori antiquities and myths; Dr. Lench, assistant in the observatory at ZÜrich, Switzerland; Dr. Franz Lang, rector and teacher of natural history in the cantonal schools of Soleure, Switzerland, and one of the presidents of the Swiss Natural History Society, aged seventy-eight years; Dr. William Rutherford, professor of physiology in the University of Edinburgh, and author of several books in that science, February 21st, in his sixtieth year; and Sir Douglas Galton, president of the British Association in 1895 and an authority and author on sanitation, March 10th, in his seventy seventh year.