SCIEITMC PUBLICATIOIS. 



SUICIDE : 



AN ESSAY IN COMPARATIVE MORAL STATISTICS. By Henry Morselli, 

 Professor of Psychological Medicine in the Royal University, Turin. 12n20, 

 cloth. Price, $1.75. 



"Suicide" is a scisntiflc inquiry, on the basis of the statistical method, into the laws 

 of suicidal phenomena. Dealiiia; with the eubject as a branch of social science, it con- 

 siders the increase of suicides in ditferent countries, and tlie comparison of nations, races, 

 and periods in its manifestation. The influences of age, sex, constitution, climate, season, 

 occupation, reliaiion, prevailini: ideas, the elements of character, the tendencies of civiliza- 

 tion, are coniprehensivelv analyzed in their bearing upon the propensity to eelf-destruc- 

 ton. Professor Morselli is an eminent European authority on this subject. It is accom- 

 panied by colored maps illustrating pictorially the results of statistical inquiries. 



VOLCANOES : 



WHAT THEY ARE AND WHAT THEY TEACH. By J. W. Jodd, Professor 

 of Geology in the Royal School of Mines (London). With Ninety-six Illus- 

 trations. 12mo, cloth. $2.00. 



" In no field has modern research been more fniitful than in that of which Profes'^or 

 «ludd gives a popular account in the present volume. The great lines of dynamical, geo- 

 logical, and meteorological inquiry converge upon the grand problem of the interior con- 

 stitution of the earth, and the vast influence of subterranean agencies. . . . His book is 

 very far from being a mere dry description of volcanoes and their eruptions ; it is rat her 

 a presentation of the terrestrial facts and laws with which volcanic phenomena are asso- 

 ciated." — Popular Science Monthly. 



"The volume before us is one of the pleasantest ecience manuals we have read for 

 some t\me.^^ —Athenceum. 



"Mr. Judd's summary is so full and so concise, that it is almost impossible to give a 

 fair idea in a short review." — FaU Mall Gazette. 



THE SUN. 



By C. A. Young, Ph. D., LL. D., Professor of Astronomy in the College of New 

 Jersey. With numerous Illustrations. 12mo, cloth. $2.00. 



" Professor Young is an authority on ' The Sun,' and writes from intimate knowledge. 

 He has studied that great luminary all his life, invented and improved instruments for ob- 

 serving it, gone to all quarters of the world in search of the best places and opporlunitiee 

 to watch it, and has contributed important discoveries that have extended our knowledge 

 of it. 



" It would take a cyclopaedia to represent all that has been done toward clearing up the 

 solar mysteries. Professor Young has summarized the information, and presented it in 

 a form completely available for general readers. There is no rhetoric in his book; lie 

 trui-ts the grandeur of his theme to kindle interest and impress the feelings. His stnte- 

 ments are plain, direct, clear, and condensed, though ample enough for his purpose, and 

 the substance of what is generally wanted will be found accurately given in Lis pages." — 

 Popular Science Monthly. 



ILLUSIONS : 



A PSYCHOLOGICAL STUDY. By James Sully, author of "Sensation and 

 Intuition," etc. ]2mo, cloth. $1.50. 



" An interesting contribution by Air. James Sully to the study of mental pathology. 

 The author's field of inquiry covers all the phenomena of illusion obscrs'ed in scnse-jier- 

 coption, in the introspection of the mind's own feelings, in the reading of others' feelings, 

 in memory, and in belief. The author's conclusions are often illustrated by concrete ex- 

 ample or anecdote, and his general treatment of the subject, while essentially scientific, is 

 snfflcienlly clear and animated to attract the general reader."— JV«w York Sun, 



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



