Scientific Publications of D. Appleton & Co. 



DARWIN THE 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. With Copious 

 Index. 1 vol., 12mo. Cloth. Price, 

 $2.00. 



THE DESCENT OF MAN, and 



Selection in Relation to Sex, With 

 many Illustrations. 2 vols., 12mo. 

 Cloth. Price, $4.00. 



This work, in which the author expresses his 

 peculiar views boldly and forcibly, has been 

 widely read and criticised, and, whatever may 

 be the opinion arrived at in regard to his theo- 

 ries, the reader cannot fail to obtain pleasure 

 and profit in its perusal. 



JOURNAL OF RESEARCHES into 



the Natural History and Geology of the 

 Countries visited during the Voyage of 

 H. M. S. Beagle rouno. the World. A 

 new edition, uniform with " Origin cf 

 Species " and " Descent of Man. 1 vol., 

 12mo. Cloth. Price, $2.00. 



An interesting account of a voyage of scien- 

 tific research and discovery. 



HUXLEY. MAN'S PLACE IN NA- 

 TURE. 1 vol., 12mo. Cloth. Price, 

 $1.25. 



ON THE ORIGIN OF SPECIES. 



1 vol., 12mo. Cloth. Price, $1.00. 



LAY SERMONS, Addresses, and 



Reviews. 1 vol., 12mo. Cloth. Price, 

 $1.75. 



ELEMENTS OF PHYSIOLOGY, 



and Hygiene. By T. H. Huxley and 

 W. J. Youmans. 1 vol., 12mo. $1.75. 



MORE CRITICISMS ON DARWIN, 



and Administrative Nihilism. 1 vol., 

 12mo. Price, 50 cents. 



Valuable to all who are interested in scientific 

 study or reading. 



PROCTOR (R. A.) OTHER WORLDS 

 THAN OURS : the Plurality of Worlds, 

 Studied under the Light of Recent Sci- 

 entific Researches. By Richard A. 

 Proctor, B. A., F. R. A. S., author of 

 " Saturn and its System," " Sun Views 

 of the Earth," " Half Hours with the 

 Telescope," etc. With Illustrations, 

 some colored. 12mo. Cloth. Price, 

 2.50. 



PROCTOR (R. A.) LIGHT SCIENCE 

 FOR LEISURE HOURS. A Series of 

 Familiar Essays on Scientific Subjects, 

 Natural Phenomena, etc. 1 vol., 12 mo. 

 Cloth. Price, $1.75. 



An instructive and entertaining volume to 

 the student of science, and of astronomy. 



SPENCER (HERBERT).-educa- 



TION, Intellectual, Moral, and Physi- 

 cal. 12mo. Cloth. Price, $1.25. 



FIRST PRINCIPLES. 12mo. Cloth. 



Price, $2.50. 



CLASSIFICATION OF THE SCI- 

 ENCES. 8vo. Paper. Price, 25 cts. 



ESSAYS : Moral, Political, and ^Es- 



thetic. 1 vol., 12mo. Cloth. Price, 

 $2.50. 



ILLUSTRATIONS OF UNIVER- 

 SAL PROGRESS. A Selection of his 

 best Papers. 1 vol., 12mo. Cloth. 

 Price, $2.50. 



SOCIAL STATICS; or, the Con- 

 ditions Essential to Human Happiness 

 Specified, and the First of them Devel- 

 oped. 1 vol., 12mo. Cloth. Price, 



$2.50. 



THE PRINCIPLES OF BIOLOGY, 



2 vols., 12mo. Cloth. Price, $5.00. 



THE PRINCIPLES OF PSYCHOL- 

 OGY: Part I. Data of Psychology. 

 1 vol. Paper. Price, 75 cents ; Part 

 II. The Inductions of Psychology. 

 1 vol., 8vo. Paper. Price, 75 cents ; 

 Part III. General Synthesis ; Part IV. 

 Special Synthesis. Paper. Price, 

 $1.00; Part V. Physical Synthesis. 

 Paper. Price, 75 cents. 



THE PRINCIPLES OF PSYCHOL- 



OGY. Vol. I., 8vo. Cloth. Price, $2.50. 

 WORKS. 7 vols., Svo. Half Calf. 



Price, $28.00. 



The works of Herbert Spencer have attained 

 a prominence and a reputation in America 

 even greater than in England, and he stands the 

 acknowledged leader of a school of philosophy 

 which counts many students and thinker* 

 among his followers. 



