Origin of Species by Means of Natural Selection, or the Preservation of Favored Races in the Struggle for Life. New and revised edition, with Additions. 12mo. Cloth, $2.00. Descent of Man, and Selection in Relation to Sex. With many Illustrations. A new edition. 12mo. Cloth, $3.00. Journal of Researches into the Natural History and Geol ogy of the Countries visited during the Voyage of H. M.S. Beagle round the World. A new edition. 12mo. Cloth, $2.00. Emotional Expressions of Man and the Lower Animais. 12mo. Cloth, $3.50. The Variations of Animals and Plants under Domestication. With a Preface, by Professor Asa GRAY. 2 vols. Illus. trated. Cloth, $5.00. Insectivorous Plants. 12mo. Cloth, $2.00. Movements and Habits of Climbing Plants. With Illustra. tions. 12mo. Cloth, $1.25. The Various Contrivances by which Orchids are Fertilized by Insects. Revised edition, with Illustrations. 12mo. Cloth, $1.75. The Effects of Cross and Self Fertilization in the Vegetable Kingdom. 12mo. 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"The present volume, the first and most popularly written of all the author's works, has an interest not only for the intrinsic value and importance of its discussions, but as foreshadowing the philosophical scheme which it has become the business of his life to unfold. With various things, perhaps, that he can not accept, the reader will find the great subjects of society, the laws of social growth and improvement, the rights, claims, and duties of various classes of the community, and the philosophy of education, government, and human progress considered as problems of science, and with the author's usual affluence of illustration and remarkable powers of reasoning. But he will further find that the work involves a fundamental organizing thought, that of Evolution, which has become the central and governing idea of all his philosophical labors."-American Introductory Notice. ILLUSTRATIONS OF UNIVERSAL PROGRESS. 12mo. Cloth, $2.00. 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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. YOUMANA 12mo. $1.50. For sale by all booksellers; or sent by mail, post-paid, on receipt of price. D. APPLETON & CO., Publishers, 1, 3. & 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 zoölogy, 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 |