Each book complete in One Volume, 12mo, and bound in Cloth.

1. FORMS OF WATER: A Familiar Exposition of the Origin and Phenomena of Glaciers. By J. Tyndall, LL. D., F. R. S. With 25 Illustrations. $1.50.
2. PHYSICS AND POLITICS; Or, Thoughts on the Application of the Principles of “Natural Selection” and “Inheritance” to Political Society. By Walter Bagehot. $1.50.
3. FOODS. By Edward Smith, M. D., LL. B., F. R. S. With numerous Illustrations. $1.75.
4. MIND AND BODY: The Theories of their Relation. By Alexander Bain, LL. D. With 4 Illustrations. $1.50.
5. THE STUDY OF SOCIOLOGY. By Herbert Spencer. $1.50.
6. THE NEW CHEMISTRY. By Professor J. P. Cooke, of Harvard University. With 31 Illustrations. $2.00.
7. ON THE CONSERVATION OF ENERGY. By Balfour Stewart, M. A., LL. D., F. R. S. With 14 Illustrations. $1.50.
8. ANIMAL LOCOMOTION; or, Walking, Swimming, and Flying. By J. B. Pettigrew, M. D., F. R. S., etc. With 130 Illustrations. $1.75.
9. RESPONSIBILITY IN MENTAL DISEASE. By Henry Maudsley, M. D. $1.50.
10. THE SCIENCE OF LAW. By Professor Sheldon Amos. $1.75.
11. ANIMAL MECHANISM: A Treatise on Terrestrial and AËrial Locomotion. By Professor E. J. Marey. With 117 Illustrations. $1.75.
12. THE HISTORY OF THE CONFLICT BETWEEN RELIGION AND SCIENCE. By J. W. Draper, M. D., LL. D. $1.75.
13. THE DOCTRINE OF DESCENT AND DARWINISM. By Professor Oscar Schmidt (Strasburg University). With 26 Illustrations. $1.50.
14. THE CHEMICAL EFFECTS OF LIGHT AND PHOTOGRAPHY. By Dr. Hermann Vogel (Polytechnic Academy of Berlin). Translation thoroughly revised. With 100 Illustrations. $2.00.
15. FUNGI: Their Nature, Influences, Uses, etc. By M. C. Cooke, M. A., LL. D. Edited by the Rev. M. J. Berkeley, M. A., F. L. S. With 109 Illustrations. $1.50.
16. THE LIFE AND GROWTH OF LANGUAGE. By Professor William Dwight Whitney, of Yale College. $1.50.
17. MONEY AND THE MECHANISM OF EXCHANGE. By W. Stanley Jevons, M. A., F. R. S. $1.75.
18. THE NATURE OF LIGHT, with a General Account of Physical Optics. By Dr. Eugene Lommel. With 188 Illustrations and a Table of Spectra in Chromo-lithography. $2.00.
19. ANIMAL PARASITES AND MESSMATES. By Monsieur Van Beneden. With 83 Illustrations. $1.50.
20. FERMENTATION. By Professor SchÜtzenberger. With 28 Illustrations. $1.50.
21. THE FIVE SENSES OF MAN. By Professor Bernstein. With 91 Illustrations. $1.75.
22. THE THEORY OF SOUND IN ITS RELATION TO MUSIC. By Professor Pietro Blaserna. With numerous Illustrations. $1.50.
23. STUDIES IN SPECTRUM ANALYSIS. By J. Norman Lockyer, F. R. S. With 6 Photographic Illustrations of Spectra, and numerous Engravings on Wood. $2.50.
24. A HISTORY OF THE GROWTH OF THE STEAM-ENGINE. By Professor R. H. Thurston. With 163 Illustrations. $2.50.
25. EDUCATION AS A SCIENCE. By Alexander Bain, LL. D. $1.75.
26. STUDENTS’ TEXT-BOOK OF COLOR; Or, Modern Chromatics. With Applications to Art and Industry. By Professor Ogden N. Rood, Columbia College. New edition. With 130 Illustrations. $2.00.
27. THE HUMAN SPECIES. By Professor A. de Quatrefages, Membre de l’Institut. $2.00.
28. THE CRAYFISH: An Introduction to the Study of ZoÖlogy. By T. H. Huxley, F. R. S. With 82 Illustrations. $1.75.
29. THE ATOMIC THEORY. By Professor A. Wurtz. Translated by E. Cleminshaw, F. C. S. $1.50.
30. ANIMAL LIFE AS AFFECTED BY THE NATURAL CONDITIONS OF EXISTENCE. By Karl Semper. With 2 Maps and 106 Woodcuts. $2.00.
31. SIGHT: An Exposition of the Principles of Monocular and Binocular Vision. By Joseph Le Conte, LL. D. With 132 Illustrations. $1.50.
32. GENERAL PHYSIOLOGY OF MUSCLES AND NERVES. By Professor J. Rosenthal. With 75 Illustrations. $1.50.
33. ILLUSIONS: A Psychological Study. By James Sully. $1.50.
34. THE SUN. By C. A. Young, Professor of Astronomy in the College of New Jersey. With numerous Illustrations. $2.00.
35. VOLCANOES: What they Are and what they Teach. By John W. Judd, F. R. S., Professor of Geology in the Royal School of Mines. With 96 Illustrations. $2.00.
36. SUICIDE: An Essay in Comparative Moral Statistics. By Henry Morselli, M. D., Professor of Psychological Medicine, Royal University, Turin. $1.75.
37. THE FORMATION OF VEGETABLE MOULD, THROUGH THE ACTION OF WORMS. With Observations on their Habits. By Charles Darwin, LL. D., F. R. S. With Illustrations. $1.50.
38. THE CONCEPTS AND THEORIES OF MODERN PHYSICS. By J. B. Stallo. $1.75.
39. THE BRAIN AND ITS FUNCTIONS. By J. Luys. $1.50.
40. MYTH AND SCIENCE. By Tito Vignoli. $1.50.
41. DISEASES OF MEMORY: An Essay in the Positive Psychology. By Th. Ribot, author of “Heredity.” $1.50.
42. ANTS, BEES, AND WASPS. A Record of Observations of the Habits of the Social Hymenoptera. By Sir John Lubbock, Bart., F. R. S., D. C. L., LL. D., etc. $2.00.
43. SCIENCE OF POLITICS. By Sheldon Amos. $1.75.
44. ANIMAL INTELLIGENCE. By George J. Romanes. $1.75.
45. MAN BEFORE METALS. By N. Joly, Correspondent of the Institute. With 148 Illustrations. $1.75.
46. THE ORGANS OF SPEECH AND THEIR APPLICATION IN THE FORMATION OF ARTICULATE SOUNDS. By G. H. von Meyer, Professor in Ordinary of Anatomy at the University of ZÜrich. With 47 Woodcuts. $1.75.
47. FALLACIES: A View of Logic from the Practical Side. By Alfred Sidgwick, B. A., Oxon. $1.75.
48. ORIGIN OF CULTIVATED PLANTS. By Alphonse de Candolle. $2.00.
49. JELLY-FISH, STAR-FISH, AND SEA-URCHINS. Being a Research on Primitive Nervous Systems. By George J. Romanes. $1.75.
50. THE COMMON SENSE OF THE EXACT SCIENCES. By the late William Kingdon Clifford. $1.50.
51. PHYSICAL EXPRESSION: Its Modes and Principles. By Francis Warner, M. D., Assistant Physician, and Lecturer on Botany to the London Hospital, etc. With 51 Illustrations. $1.75.
52. ANTHROPOID APES. By Robert Hartmann, Professor in the University of Berlin. With 63 Illustrations. $1.75.
53. THE MAMMALIA IN THEIR RELATION TO PRIMEVAL TIMES. By Oscar Schmidt. $1.50.
54. COMPARATIVE LITERATURE. By Hutcheson Macaulay Posnett, M. A., LL. D., F. L. S., Barrister-at-Law; Professor of Classics and English Literature, University College, Auckland, New Zealand, author of “The Historical Method,” etc. $1.75.
55. EARTHQUAKES AND OTHER EARTH MOVEMENTS. By John Milne, Professor of Mining and Geology in the Imperial College of Engineering, Tokio, Japan. With 38 Figures.

New York: D. APPLETON & CO., 1, 3, & 5 Bond Street.

By J. W. JUDD,
Professor of Geology in the Royal School of Mines (London).

With Ninety-six Illustrations. 12mo. Cloth, $2.00.

“The volume before us is one of the pleasantest science manuals we have read for some time.”—AthenÆum.

“Mr. Judd’s summary is so full and so concise, that it is almost impossible to give a fair idea in a short review.”—Pall Mall Gazette.

“Professor Judd discusses the nature of volcanic action, the internal structure of volcanic mountains, the distribution of volcanoes upon the surface of the globe, their activity in different periods of the earth’s existence, the use of volcanoes in the economy of nature, the various theories that have been made to explain volcanic action. He has abbreviated in this volume a vast amount of information, which has a fascinating interest for many minds by reason of its relation to the past history and future destiny of this little bubble of earth upon which we sail through the infinite spaces of ether.”—New York Home Journal.

“The book gives an exhaustive statement of the phenomena of volcanoes, and of the facts in the formation of mountain-chains, and relates a mass of interesting observations and facts, the results of patient and extensive personal investigation and study, mostly in different places in Southern Europe, but not neglecting the world’s larger volcanoes in other regions.”—Hartford Times.

“A fascinating example of patient observation, sound judgment, and acute reasoning. Under Professor Judd’s skillful treatment the volcano is forced not only to tell its own history, but also to solve a number of earth problems seemingly disconnected with it; and the story is told in strong, nervous language, and with an earnestness and subdued enthusiasm that are delightfully stimulating.”—Boston Gazette.

“Professor Judd first points out the errors in the old definition of a volcano. The volcanic hole is very often not on the summit, but on the side, sometimes at the base of the mountain or hill, and it sends forth steam rather than smoke, and the supposed raging flames are nothing more than the glowing light of a mass of molten material reflected from those vapor-clouds. So our old ignorance vanishes, and in this admirable work the internal structure of volcanic mountains, the nature and products of volcanic action, and the distribution of the materials rejected from volcanic vents, the succession of operations taking place at volcanic centers, are all very ably and clearly discussed.”—Philadelphia Times.

“A succinct and excellent treatise on a very interesting subject.”—Philadelphia North American.

For sale by all booksellers; or sent by mail, post paid, on receipt of price.

New York: D. APPLETON & CO., 1, 3, & 5 Bond Street.

The Concepts and Theories of Modern Physics.

By J. B. STALLO.

12mo, cloth $1.75.

“Judge Stallo’s work is an inquiry into the validity of those mechanical conceptions of the universe which are now held as fundamental in physical science. He takes up the leading modern doctrines which are based upon this mechanical conception, such as the atomic constitution of matter, the kinetic theory of gases, the conservation of energy, the nebular hypothesis, and other views, to find how much stands upon solid empirical ground, and how much rests upon metaphysical speculation. Since the appearance of Dr. Draper’s ‘Religion and Science,’ no book has been published in the country calculated to make so deep an impression on thoughtful and educated readers as this volume.... The range and minuteness of the author’s learning, the acuteness of his reasoning, and the singular precision and clearness of his style, are qualities which very seldom have been jointly exhibited in a scientific treatise.”—New York Sun.

“Judge J. B. Stallo, of Cincinnati, is a German by birth, and came to this country at about the age of seventeen. He was early familiar with science, and he lectured for some years in an Eastern college; but at length he adopted the profession of law. He is also remembered by many as an author, having a number of years ago written a metaphysical treatise of marked ability for one of his youthful years. His present book must be read deliberately, must be studied to be appreciated; but the students of science, as well as those of metaphysics, are certain to be deeply interested in its logical developments. It is a timely and telling contribution to the philosophy of science, imperatively called for by the present exigencies in the progress of knowledge. It is to be commended equally for the solid value of its contents and the scholarly finish of its execution.”—The Popular Science Monthly.

“The book is of vital interest to a much larger class than specialists—to all, in fact, who value clear thinking or are interested in the accuracy more than the progress of scientific thought. It deals with the results and theories of physical science, and in no sense with the processes of the laboratory. It is written with a clearness that is uncommon in philosophic works and with a desire to find truth, conscious of the fact that a prime prerequisite of finding it is to clear the way of accumulated and fast-settling untruths. It is a scientific rebuke, as severe as it is lucid, of the scientists who leave their apparatus and go star-gazing: here is the pit into which they have fallen.”—New York World.

“The volume is an important contribution to scientific discussion, and is marked by closeness of reasoning, and clearness and cogency of statement.”—Boston Journal.

For sale by all booksellers; or sent by mail, post paid, on receipt of price.

New York: D. APPLETON & CO., 1, 3, & 5 Bond Street.