The story of man before the discovery of metal and the attainment of civilisation is notoriously divided into a Palaeolithic (Old Stone) Age, and a Neolithic (New Stone) Age. Each of these ages is now subdivided into stages, which we will review in succession. But it is important to conceive the whole story of man in more correct proportion than this familiar division suggests. The historical or civilised period is now computed at about ten thousand years. The Neolithic Age, which preceded civilisation, is usually believed to be about four or five times as long, though estimates of its duration vary from about twenty to a hundred thousand years. The Palaeolithic Age in turn is regarded as at least three or four times as long as the Neolithic; estimates of time vary from a hundred to five hundred thousand years. And before this there is the vast stretch of time in which the ape slowly became a primitive human.

This long, early period is, as we saw, still wrapped in mist and controversy. A few bones tell of a race living, in semi-human shape, in the region of the Indian Ocean; a few crude stones are held by many to indicate that a more advanced, but very lowly race, wandered over the south of Europe and north of Africa before the Ice-Age set in. The starting-point or cradle of the race is not known. The old idea of seeking the patriarchal home on the plains to the north of India is abandoned, and there is some tendency to locate it in the land which has partly survived in the islands of the Indian Ocean. The finding of early remains in Java is not enough to justify that conclusion, but it obtains a certain probability when we notice the geographical distribution of the Primates. The femurs and the apes are found to-day in Africa and Asia alone; the monkeys have spread eastward to America and westward to Europe and Africa; the human race has spread north-eastward into Asia and America, northwestward into Europe, westward into Africa, and southward to Australia and the islands. This distribution suggests a centre in the Indian Ocean, where there was much more land in the Tertiary Era than there is now. We await further exploration in that region and Africa.

There is nothing improbable in the supposition that man wandered into Europe in the Tertiary, and has left in the Eoliths the memorials of his lowly condition. The anthropoid apes certainly reached France. However that may be, the Ice-Age would restrict all the Primates to the south. It will be seen, on a glance at the map, that a line of ice-clad mountains would set a stern barrier to man's advance in the early Pleistocene, from the Pyrenees to the Himalaya, if not to the Pacific. He therefore spread westward and southward. One branch wandered into Australia, and was afterwards pressed by more advanced invaders (the present blacks of Australia) into Tasmania, which seems to have been still connected by land. Another branch, or branches, spread into Africa, to be driven southward, or into the central forests, by later and better equipped invaders. They survive, little changed (except by recent contact with Europeans), in the Bushmen and in large populations of Central Africa which are below the level of tribal organisation. Others remained in the islands, and we seem to have remnants of them in the Kalangs, Veddahs, etc. But these islands have been repeatedly overrun by higher races, and the primitive life has been modified.

Comparing the most isolated of these relics of early humanity, we obtain many suggestions about the life of that remote age. The aboriginal Tasmanians, who died out about forty years ago, were of great evolutionary interest. It is sometimes said that man is distinguished from all other animals by the possession of abstract ideas, but the very imperfect speech of the Tasmanians expressed no abstract ideas. Their mind seems to have been in an intermediate stage of development. They never made fire, and, like the other surviving fragments of early humanity, they had no tribal organisation, and no ideas of religion or morality.

The first effect of the Ice-Age on this primitive humanity would be to lead to a beginning of the development of racial characters. The pigment under the skin of the negro is a protection against the actinic rays of the tropical sun; the white man, with his fair hair and eyes, is a bleached product of the northern regions; and the yellow or brown skin seems to be the outcome of living in dry regions with great extremes of temperature. As the northern hemisphere divided into climatic zones these physical characters were bound to develop. The men who went southward developed, especially when fully exposed to the sun on open plains, the layer of black pigment which marks the negroid type. There is good reason, as we shall see to think that man did not yet wear clothing, though he had a fairly conspicuous, if dwindling, coat of hair. On the other hand the men who lingered further north, in South-western Asia and North Africa, would lose what pigment they had, and develop the lighter characters of the northerner. It has been noticed that even a year in the arctic circle has a tendency to make the eyes of explorers light blue. We may look for the genesis of the vigorous, light-complexioned races along the fringe of the great ice-sheet. It must be remembered that when the limit of the ice-sheet was in Central Germany and Belgium, the climate even of North Africa would be very much more temperate than it is to-day.

As the ice-sheet melted, the men who were adapted to living in the temperate zone to the south of it penetrated into Europe, and the long story of the Old Stone Age opened. It must not, of course, be supposed that this stage of human culture only began with the invasion of Europe. Men would bring their rough art of fashioning implements with them, but the southern regions are too little explored to inform us of the earlier stage. But as man enters Europe he begins to drop his flints on a soil that we have constant occasion to probe—although the floor on which he trod is now sometimes forty or fifty feet below the surface—and we obtain a surer glimpse of the fortunes of our race.

Most European geologists count four distinct extensions of the ice-sheet, with three interglacial periods. It is now generally believed that man came north in the third interglacial period; though some high authorities think that he came in the second. As far as England is concerned, it has been determined, under the auspices of the British Association, that our oldest implements (apart from the Eoliths) are later than the great ice-sheet, but there is some evidence that they precede the last extension of the ice.

Two stages are distinguished in this first part of the Palaeolithic Age—the Acheulean and Chellean—but it will suffice for our purpose to take the two together as the earlier and longer section of the Old Stone Age. It was a time of temperate, if not genial, climate. The elephant (an extinct type), the rhinoceros, the hippopotamus, the hyaena, and many other forms of animal life that have since retired southward, were neighbours of the first human inhabitant of Europe. Unfortunately, we have only one bone of this primitive race, the jaw found at Mauer in 1907, but its massive size and chinless contour suggest a being midway between the Java man and the Neanderthal race. His culture confirms the supposition. There is at this stage no clear trace of fire, clothing, arrows, hefted weapons, spears, or social life. As the implements are generally found on old river-banks or the open soil, not in caves, we seem to see a squat and powerful race wandering, homeless and unclad, by the streams and broad, marshy rivers of the time. The Thames and the Seine had not yet scooped out the valleys on the slopes of which London and Paris are built.

This period seems, from the vast number of stone implements referred to it, to have lasted a considerable time. There is a risk in venturing to give figures, but it may be said that few authorities would estimate it at less than a hundred thousand years. Man still advanced with very slow and uncertain steps, his whole progress in that vast period being measured by the invention of one or two new forms of stone implements and a little more skill in chipping them. At its close a great chill comes over Europe—the last ice-sheet is, it seems, spreading southward—and we enter the Mousterian period and encounter the Neanderthal race which we described in the preceding chapter.

It must be borne in mind that the whole culture of primitive times is crushed into a few feet of earth. The anthropologist is therefore quite unable to show us the real succession of human stages, and has to be content with a division of the whole long and gradual evolution into a few well-marked phases. These phases, however, shade into each other, and are merely convenient measurements of a continuous story. The Chellean man has slowly advanced to a high level. There is no sudden incoming of a higher culture or higher type of man. The most impressive relics of the Mousterian period, which represent its later epoch, are merely finely chipped implements. There is no art as yet, no pottery, and no agriculture; and there is no clear trace of the use of fire or clothing, though we should be disposed to put these inventions in the chilly and damp Mousterian period. There is therefore no ground for resenting the description, "the primeval savage," which has been applied to early man. The human race is already old, yet, as we saw, it is hardly up to the level of the Australian black. The skeleton found at Chapelle-aux-Saints is regarded as the highest known type of the race, yet the greatest authority on it, M. Boule, says emphatically: "In no actual race do we find the characters of inferiority—that is to say, the ape-like features—which we find in the Chapelle-aux-Saints head." The largeness of the head is in proportion to the robust frame, but in its specifically human part—the front—it is very low and bestial; while the heavy ridges over the large eyes, the large flat stumpy nose, the thick bulge of the lips and teeth, and the almost chinless jaw, show that the traces of his ancestry cling close to man after some hundreds of thousands of years of development.

The cold increases as we pass to the last part of the Old Stone Age, the Solutrean and Magdalenian periods; and nothing is clearer than that the pace of development increases at the same time. Short as the period is, in comparison with the preceding, it witnesses a far greater advance than had been made in all the rest of the Old Stone Age. Beyond a doubt men now live in caves, in large social groups, make clothing from the skins of animals, have the use of fire, and greatly improve the quality of their stone axes, scrapers, knives, and lance-heads. There is at last some promise of the civilisation that is coming. In the soil of the caverns in which man lived, especially in Southern France and the Pyrenean region, we find the debris of a much larger and fuller life. Even the fine bone needles with which primitive man sewed his skin garments, probably with sinews for thread, survive in scores. In other places we find the ashes of the fires round which he squatted, often associated with the bones of the wild horses, deer, etc., on which he lived.

But the most remarkable indication of progress in the "cave-man" is his artistic skill. Exaggerated conclusions are sometimes drawn from the statuettes, carvings, and drawings which we find among the remains of Magdalenian life. Most of them are crude, and have the limitations of a rustic or a child artist. There is no perspective, no grouping. Animals are jumbled together, and often left unfinished because the available space was not measured. There are, however, some drawings—cut on bone or horn or stone with a flint implement—which evince great skill in line-drawing and, in a few cases, in composition. Some of the caves also are more or less frescoed; the outlines of animals, sometimes of life-size and in great numbers, are cut in the wall, and often filled in with pigment. This skill does not imply any greater general intelligence than the rest of the culture exhibits. It implies persistent and traditional concentration upon the new artistic life. The men who drew the "reindeer of Thayngen" and carved the remarkable statuettes of women in ivory or stone, were ignorant of the simplest rudiments of pottery or agriculture, which many savage tribes possess.

Some writers compare them with the Eskimo of to-day, and even suggest that the Eskimo are the survivors of the race, retreating northward with the last ice-sheet, and possibly egged onward by a superior race from the south. It is, perhaps, not a very extravagant claim that some hundreds of thousands of years of development—we are now only a few tens of thousands of years from the dawn of civilisation—had lifted man to the level of the Eskimo, yet one must hesitate to admit the comparison. Lord Avebury reproduces an Eskimo drawing, or picture-message, in his "Prehistoric Times," to which it would be difficult to find a parallel in Magdalenian remains. I do not mean that the art is superior, but the complex life represented on the picture-message, and the intelligence with which it is represented, are beyond anything that we know of Palaeolithic man. I may add that nearly all the drawings and statues of men and women which the Palaeolithic artist has left us are marked by the intense sexual exaggeration—the "obscenity," in modern phraseology—which we are apt to find in coarse savages.

Three races are traced in this period. One, identified by skeletons found at Mentone and by certain statuettes, was negroid in character. Probably there was an occasional immigration from Africa. Another race (Cro-Magnon) was very tall, and seems to represent an invasion from some other part of the earth toward the close of the Old Stone Age. The third race, which is compared to the Eskimo, and had a stature of about five feet, seem to be the real continuers of the Palaeolithic man of Europe. Curiously enough, we have less authentic remains of this race than of its predecessor, and can only say that, as we should expect, the ape-like features—the low forehead, the heavy frontal ridges, the bulging teeth, etc.—are moderating. The needles we have found—round, polished, and pierced splinters of bone, sometimes nearly as fine as a bodkin—show indisputably that man then had clothing, but it is curious that the artist nearly always draws him nude. There is also generally a series of marks round the contour of the body to indicate that he had a conspicuous coat of hair. Unfortunately, the faces of the men are merely a few unsatisfactory gashes in the bone or horn, and do not picture this interesting race to us. The various statuettes of women generally suggest a type akin to the wife of the Bushman.

We have, in fine, a race of hunters, with fine stone knives and javelins. Toward the close of the period we find a single representation of an arrow, which was probably just coming into use, but it is not generally known in the Old Stone Age. One of the drawings seems to represent a kind of bridle on a horse, but we need more evidence than this to convince us that the horse was already tamed, nor is there any reason to suppose that the dog or reindeer had been tamed, or that the ground was tilled even in the most rudimentary way. Artistic skill, the use of clothing and fire, and a finer feeling in the shaping of weapons and implements, are the highest certain indications of the progress made by the end of the Old Stone Age.

But there was probably an advance made which we do not find recorded, or only equivocally recorded, in the memorials of the age. Speech was probably the greatest invention of Magdalenian man. It has been pointed out that the spine in the lower jaw, to which the tongue-muscle is attached, is so poorly developed in Palaeolithic man that we may infer from it the absence of articulate speech. The deduction has been criticised, but a comparison of the Palaeolithic jaw with that of the ape on one hand and modern man on the other gives weight to it. Whatever may have been earlier man's power of expression, the closer social life of the Magdalenian period would lead to a great development of it. Some writers go so far as to suggest that certain obscure marks painted on pebbles or drawn on the cavern-walls by men at the close of the Palaeolithic Age may represent a beginning of written language, or numbers, or conventional signs. The interpretation of these is obscure and doubtful. It is not until ages afterwards that we find the first clear traces of written language, and then they take the form of pictographs (like the Egyptian hieroglyphics or the earliest Chinese characters).

We cannot doubt, however, that articulate speech would be rapidly evolved in the social life of the later Magdalenian period, and the importance of this acquisition can hardly be exaggerated. Imagine even a modern community without the device of articulate language. A very large proportion of the community, who are now maintained at a certain level by the thought of others, communicated to them by speech, would sink below the civilised standard, and the transmission and improvement of ideas would be paralysed. It would not be paradoxical to regard the social life and developing speech of Magdalenian man as the chief cause of the rapid advance toward civilisation which will follow in the next period.

And it is not without interest to notice that a fall in the temperature of the earth is the immediate cause of this social life. The building of homes of any kind seems to be unknown to Magdalenian man. The artist would have left us some sketchy representation of it if there had been anything in the nature of a tent in his surroundings. The rock-shelter and the cave are the homes which men seek from the advancing cold. As these are relatively few in number, fixed in locality, and often of large dimensions, the individualism of the earlier times is replaced by collective life. Sociologists still dispute whether the clan arose by the cohesion of families or the family arose within the clan. Such evidence as is afforded by prehistoric remains is entirely in favour of the opinion of Professor Westermarck, that the family preceded the larger group. Families of common descent would now cling together and occupy a common cavern, and, when the men gathered at night with the women for the roasting and eating of the horse or deer they had hunted, and the work of the artist and the woman was considered, the uncouth muttering and gesticulating was slowly forged into the great instrument of articulate speech. The first condition of more rapid progress was instinctively gained.

Our story of life has so often turned on this periodical lowering of the climate of the earth that it is interesting to find this last and most important advance so closely associated with it that we are forced once more to regard it as the effective cause. The same may be said of another fundamental advance of the men of the later Palaeolithic age, the discovery of the art of making fire. It coincides with the oncoming of the cold, either in the Mousterian or the Magdalenian. It was more probably a chance discovery than an invention. Savages so commonly make fire by friction—rubbing sticks, drills, etc.—that one is naturally tempted to regard this as the primitive method. I doubt if this was the case. When, in Neolithic times, men commonly bury the dead, and put some of their personal property in the grave with them, the fire-kindling apparatus we find is a flint and a piece of iron pyrites. Palaeolithic man made his implements of any kind of hard and heavy stone, and it is probable that he occasionally selected iron ore for the purpose. An attempt to chip it with flint would cause sparks that might fall on inflammable material, and set it alight. Little intelligence would be needed to turn this discovery to account.

Apart from these conjectures as to particular features in the life of prehistoric man, it will be seen that we have now a broad and firm conception of its evolution. From the ape-level man very slowly mounts to the stage of human savagery. During long ages he seems to have made almost no progress. There is nothing intrinsically progressive in his nature. Let a group of men be isolated at any stage of human evolution, and placed in an unchanging environment, and they will remain stationary for an indefinite period. When Europeans began to traverse the globe in the last few centuries, they picked up here and there little groups of men who had, in their isolation, remained just where their fathers had been when they quitted the main road of advance in the earlier stages of the Old Stone Age. The evolution of man is guided by the same laws as the evolution of any other species. Thus we can understand the long period of stagnation, or of incalculably slow advance. Thus, too, we can understand why, at length, the pace of man toward his unconscious goal is quickened. He is an inhabitant of the northern hemisphere, and the northern hemisphere is shaken by the last of the great geological revolutions. From its first stress emerges the primeval savage of the early part of the Old Stone Age, still bearing the deep imprint of his origin, surpassing his fellow-animals only in the use of crude stone implements. Then the stress of conditions relaxes—the great ice-sheet disappears—and again during a vast period he makes very little progress. The stress returns. The genial country is stripped and impoverished, and the reindeer and mammoth spread to the south of Europe. But once more the adversity has its use, and man, stimulated in his hunt for food, invigorated by the cold, driven into social life, advances to the culmination of the Old Stone Age.

We are still very far from civilisation, but the few tens of thousands of years that separate Magdalenian man from it will be traversed with relative speed—though, we should always remember, with a speed far less than the pace at which man is advancing to-day. A new principle now enters into play: a specifically human law of evolution is formulated. It has no element of mysticism, and is merely an expression of the fact that the previous general agencies of development have created in man an intelligence of a higher grade than that of any other animal. In his larger and more plastic brain the impressions received from the outer world are blended in ideas, and in his articulate speech he has a unique means of entering the idea-world of his fellows. The new principle of evolution, which arises from this superiority, is that man's chief stimulus to advance will now come from his cultural rather than his physical environment. Physical surroundings will continue to affect him. One race will outstrip another because of its advantage in soil, climate, or geographical position. But the chief key to the remaining and more important progress of mankind, which we are about to review, is the stimulating contact of the differing cultures of different races.

This will be seen best in the history of civilisation, but the principle may be recognised in the New Stone Age which leads from primeval savagery to civilisation, or, to be more accurate and just, to the beginning of the historical period. It used to be thought that there was a mysterious blank or gulf between the Old and the New Stone Age. The Palaeolithic culture seemed to come to an abrupt close, and the Neolithic culture was sharply distinguished from it. It was suspected that some great catastrophe had destroyed the Palaeolithic race in Europe, and a new race entered as the adverse conditions were removed. This was especially held to be the case in England. The old Palaeolithic race had never reached Ireland, which seems to have been cut oft from the Continent during the Ice-Age, and most of the authorities still believe—in spite of some recent claims—that it never reached Scotland. England itself was well populated, and the remains found in the caves of Derbyshire show that even the artist—or his art—had reached that district. This Palaeolithic race seemed to come to a mysterious end, and Europe was then invaded by the higher Neolithic race. England was probably detached from the Continent about the end of the Magdalenian period. It was thought that some great devastation—the last ice-sheet, a submersion of the land, or a plague—then set in, and men were unable to retreat south.

It is now claimed by many authorities that there are traces of a Middle Stone (Mesolithic) period even in England, and nearly all the authorities admit that such a transitional stage can be identified in the Pyrenean region. This region had been the great centre of the Magdalenian culture. Its large frescoed caverns exhibit the culmination of the Old Stone life, and afford many connecting links with the new. It is, however, a clearly established and outstanding fact that the characteristic art of Magdalenian man comes to an abrupt and complete close, and it does not seem possible to explain this without supposing that the old race was destroyed or displaced. If we could accept the view that it was the Eskimo-like race of the Palaeolithic that cultivated this art, and that they retreated north with the reindeer and the ice, and survive in our Eskimo, we should have a plausible explanation. In point of fact, we find no trace whatever of this slow migration from the south of Europe to the north. The more probable supposition is that a new race, with more finished stone implements, entered Europe, imposed its culture upon the older race, and gradually exterminated or replaced it. We may leave it open whether a part of the old race retreated to the north, and became the Eskimo.

Whence came the new race and its culture? It will be seen on reflection that we have so far been studying the evolution of man in Europe only, because there alone are his remains known with any fullness. But the important region which stretches from Morocco to Persia must have been an equally, if not more, important theatre of development. While Europe was shivering in the last stage of the Ice-Age, and the mammoth and reindeer browsed in the snows down to the south of France, this region would enjoy an excellent climate and a productive soil. We may confidently assume that there was a large and stirring population of human beings on it during the Magdalenian cold. We may, with many of the authorities, look to this temperate and fertile region for the slight advance made by early Neolithic man beyond his predecessor. As the cold relaxed, and the southern fringe of dreary steppe w as converted once more into genial country, the race would push north. There is evidence that there were still land bridges across the Mediterranean. From Spain and the south of France this early Neolithic race rapidly spread over Europe.

It must not be supposed that the New Stone Age at first goes much beyond the Old in culture. Works on prehistoric man are apt to give as features of "Neolithic man" all that we know him to have done or discovered during the whole of the New Stone Age. We read that he not only gave a finer finish to, and sometimes polished, his stone weapons, but built houses, put imposing monuments over his dead, and had agriculture, tame cattle, pottery, and weaving. This is misleading, as the more advanced of these accomplishments appear only late in the New Stone Age. The only difference we find at first is that the stone axes, etc., are more finely chipped or flaked, and are frequently polished by rubbing on stone moulds. There is no sudden leap in culture or intelligence in the story of man.

It would be supremely interesting to trace the evolution of human industries and ideas during the few tens of thousands of years of the New Stone Age. During that time moral and religious ideas are largely developed, political or social forms are elaborated, and the arts of civilised man have their first rude inauguration. The foundations of civilisation are laid. Unfortunately, precisely because the period is relatively so short and the advance so rapid, its remains are crushed and mingled in a thin seam of the geological chronicle, and we cannot restore the gradual course of its development with any confidence. Estimates of its duration vary from 20,000 to 70,000 years; though Sir W. Turner has recently concluded, from an examination of marks on Scottish monuments, that Neolithic man probably came on foot from Scandinavia to Scotland, and most geologists would admit that it must be at least a hundred thousand years since one could cross from Norway to Scotland on foot. As usual, we must leave open the question of chronology, and be content with a modest provisional estimate of 40,000 or 50,000 years.

We dimly perceive the gradual advance of human culture in this important period. During the Old Stone Age man had made more progress than he had made in the preceding million years; during the New Stone Age—at least one-fourth as long as the Old—he made even greater progress; and, we may add, in the historical period, which is one-fourth the length of the Neolithic Age, he will make greater progress still. The pace of advance naturally increases as intelligence grows, but that is not the whole explanation. The spread of the race, the gathering of its members into tribes, and the increasing enterprise of men in hunting and migration, lead to incessant contacts of different cultures and a progressive stimulation.

At first Neolithic man is content with finer weapons. His stone axe is so finely shaped and polished that it sometimes looks like forged or moulded metal. He also drills a clean hole through it—possibly by means of a stick working in wet sand—and gives it a long wooden handle. He digs in the earth for finer flints, and in some of his ancient shafts (Grimes, Graves and Cissbury) we find picks of reindeer horn and hollowed blocks of chalk in which he probably burned fat for illumination underground. But in the later part of the Neolithic—to which much of this finer work also may belong—we find him building huts, rearing large stone monuments, having tame dogs and pigs and oxen, growing corn and barley, and weaving primitive fabrics. He lives in large and strong villages, round which we must imagine his primitive cornfields growing and his cattle grazing, and in which there must have been some political organisation under chiefs.

When we wish to trace the beginning of these inventions we have the same difficulty that we experienced in tracing the first stages of new animal types. The beginning takes place in some restricted region, and our casual scratching of the crust of the earth or the soil may not touch it for ages, if it has survived at all. But for our literature and illustrations a future generation would be equally puzzled to know how we got the idea of the aeroplane or the electric light. In some cases we can make a good guess at the origin of Neolithic man's institutions. Let us take pottery. Palaeolithic man cooked his joint of horse or reindeer, and, no doubt, scorched it. Suppose that some Palaeolithic Soyer had conceived the idea of protecting the joint, and preserving its juices, by daubing it with a coat of clay. He would accidentally make a clay vessel. This is Mr. Clodd's ingenious theory of the origin of pottery. The development of agriculture is not very puzzling. The seed of corn would easily be discovered to have a food-value, and the discovery of the growth of the plant from the seed would not require a very high intelligence. Some ants, we may recall, have their fungus-beds. It would be added by many that the ant gives us another parallel in its keeping of droves of aphides, which it "milks." But it is now doubted if the ant deliberately cultivates the aphides with this aim. Early weaving might arise from the plaiting of grasses. If wild flax were used, it might be noticed that part of it remained strong when the rest decayed, and so the threads might be selected and woven.

The building of houses, after living for ages in stone caverns, would not be a very profound invention. The early houses were—as may be gathered from the many remains in Devonshire and Cornwall—mere rings of heaped stones, over which, most probably, was put a roof of branches or reeds, plastered with mud. They belong to the last part of the New Stone Age. In other places, chiefly Switzerland, Neolithic man lived in wooden huts built on piles in the shallow shores of lakes. It is an evidence that life on land is becoming as stimulating as we find it in the age of Deinosaurs or early mammals. These pile-villages of Switzerland lasted until the historical period, and the numerous remains in the mud of the lake show the gradual passage into the age of metal.

Before the metal age opened, however, there seem to have been fresh invasions of Europe and changes of its culture. The movements of the various early races of men are very obscure, and it would be useless to give here even an outline of the controversy. Anthropologists have generally taken the relative length and width of the skull as a standard feature of a race, and distinguished long-headed (dolichocephalic), short-headed (brachycephalic), and middle-headed (mesaticephalic) races. Even on this test the most divergent conclusions were reached in regard to early races, and now the test itself is seriously disputed. Some authorities believe that there is no unchanging type of skull in a particular race, but that, for instance, a long-headed race may become short-headed by going to live in an elevated region.

It may be said, in a few words, that it is generally believed that two races invaded Europe and displaced the first Neolithic race. The race which chiefly settled in the Swiss region is generally believed to have come from Asia, and advanced across Europe by way of the valley of the Danube. The native home of the wheat and barley and millet, which, as we know, the lake-dwellers cultivated, is said to be Asia. On the other hand, the Neolithic men who have left stone monuments on our soil are said to be a different race, coming, by way of North Africa, from Asia, and advancing along the west of Europe to Scandinavia. A map of the earth, on which the distribution of these stone monuments—all probably connected with the burial of the dead—is indicated, suggests such a line of advance from India, with a slighter branch eastward. But the whole question of these invasions is disputed, and there are many who regard the various branches of the population of Europe as sections of one race which spread upward from the shores of the Mediterranean.

It is clear at least that there were great movements of population, much mingling of types and commercial interchange of products, so that we have the constant conditions of advance. A last invasion seems to have taken place some two or three thousand years before the Christian era, when the Aryans overspread Europe. After all the controversy about the Aryans it seems clear that a powerful race, representing the ancestors of most of the actual peoples of Europe and speaking the dialects which have been modified into the related languages of the Greeks, Romans, Germans, Celts, Lithuanians, etc., imposed its speech on nearly the whole of the continent. Only in the Basques and Picts do we seem to find some remnants of the earlier non-Aryan tongues. But whether these Aryans really came from Asia, as it used to be thought, or developed in the east of Europe, is uncertain. We seem justified in thinking that a very robust race had been growing in numbers and power during the Neolithic Age, somewhere in the region of South-east Europe and Southwest Asia, and that a few thousand years before the Christian Era one branch of it descended upon India, another upon the Persian region, and another overspread Europe. We will return to the point later. Instead of being the bearers of a higher civilisation, these primitive Aryans seem to have been lower in culture than the peoples on whom they fell.

The Neolithic Age had meantime passed into the Age of Metal. Copper was probably the first metal to be used. It is easily worked, and is found in nature. But the few copper implements we possess do not suggest a "Copper Age" of any length or extent. It was soon found, apparently, that an admixture of tin hardened the copper, and the Bronze Age followed. The use of bronze was known in Egypt about 4800 B.C. (Flinders Petrie), but little used until about 2000 B.C. By that time (or a few centuries later) it had spread as far as Scandinavia and Britain. The region of invention is not known, but we have large numbers of beautiful specimens of bronze work—including brooches and hair-pins—in all parts of Europe. Finally, about the thirteenth century B.C., we find the first traces of the use of iron. The first great centre for the making of iron weapons seems to have been Hallstatt, in the Austrian Alps, whence it spread slowly over Europe, reaching Scandinavia and Britain between 500 and 300 B.C. But the story of man had long before this entered the historical period, to which we now turn.