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Manual of the Anatomy of Vertebrated Animals. Manual of the Anatomy of Invertebrated Animals. 12mo. $2.50. Lay Sermons, Addresses, and Reviews. 12mo. Cloth, $1.75. Critiques and Addresses. 12mo. Cloth, $1.50. American Addresses; with a Lecture on the Study of Biology. 12mo. Cloth, $1.25. Physiography: An Introduction to the Study of Nature. With Illustrations and Colored Plates. 12mo. Cloth, $2.50. Huxley and Youmans's Elements of Physiology and Hygiene. By T. H. HUXLEY and W. J. YOUMANS 12mo. $1.50. For sale by all booksellers; or sent by mail, post-paid, on receipt of price. D. APPLETON & CO., Publishers, 1, 8, & 5 BOND STREET, NEW YORK. OF THE MOST IMPORTANT STANDARD WORKS ON EVOLUTION. I. Origin of Species by Means of Natural Selection, or the Preservation of Favored Races in the Struggle for Life. By CHARLES DarWIN, LL. D., F. R. S. New and revised edition, with Additions. 12mo. Cloth, $2.00. "Personally and practically exercised in zoology, in minute anatomy, in geology, a student of geographical distribution, not in maps and in museums, but by long voyages and laborious collection; having largely advanced each of these branches of science, and having spent many years in gathering and sifting materials for his present work, the store of accuratelyregistered facts upon which the author of the Origin of Species' is able to draw at will is prodigious."-Professor T. H. Huxley. II. Variation of Animals and Plants under Domestication. By CHARLES DARWIN, LL. D., F. R. S. With Illustrations. Revised edition. 2 vols., 12mo. Cloth, $5.00. "We shall learn something of the laws of inheritance, of the effects of crossing different breeds, and on that sterility which often supervenes when organic beings are removed from their natural conditions of life, and likewise when they are too closely interbred."-From the Introduction, III. Descent of Man, and Selection in Relation to Sex. By CHARLES DARWIN, LL. D., F. R. S. With many Illustrations. A new edition. 12mo. Cloth, $3.00, "In these volumes Mr. Darwin has brought forward all the facts and arguments which science has to offer in favor of the doctrine that man has arisen by gradual development from the lowest point of animal life, Aside from the logical purpose which Mr. Darwin had in view, his work is an original and fascinating contribution to the most interesting portion of natural history." IV. On the Origin of Species; or, The Causes of the Phenomena of Organic Nature. By Professor T. H. HUXLEY, F. R. S. 12mo. Cloth, $1.00. "Those who disencumber Darwinism of its difficulties, simplify its statements, relieve it of technicalities, and bring it so distinctly within the horizon of ordinary apprehension that persons of common sense may judge for themselves, perform an invaluable service. Such is the character of the present volume."-From the Preface to the American edition. V. Darwiniana. Essays and Reviews pertaining to Darwinism. By Asa GRAY, Fisher Professor of Natural History (Botany) in Harvard University. 12mo. Cloth, $2.00. "Although Professor Gray is widely known in the world of science for his botanical researches, but few are aware that he is a pronounced and un |