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. VOLCANOES: _WHAT THEY ARE AND WHAT THEY TEACH_. =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._