SCIEITIEIC PUBLICATIOIS. 



SUICIDE : 



AN ESSAY IN COMPARATIVE MORAL STATISTICS. By Henry Morselli, 

 Professor of Psychological Medicine in the Royal University, Turin. 12n:o, 

 cloth. Price, $1.75. 



"Suicide" is a scientific inquiry, on the basis of the Btatistical melhod, into the laws 

 of i^uicidal phenomena. Dealiiiij: with the Buhject as? a branch of social science, it con- 

 siders the increase of suicide:? in different countries, and the comparison of nation-, races, 

 and periods in its manifestation. The influences of age, sex, constitution, climate, Hefis»m, 

 occupation, religion, prevailing ideas, the elements of character, the tendencies of civiliza- 

 tion, are comprehensivelv analyzed in their bearing upon the propensity to pelf-dcBtruc- 

 t on. Professor Morseili is an eminent European authority on this subject. It is accom- 

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



VOLCANOES : 



WHAT THEY ARE AND WHAT THEY TEACH. By J. W. Judd, Profc?sor 

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

 trations. "^12mo, cloth. 12.00. 



"In no field has modern research been more fmitfal than in that of which ProrcB<^or 

 tfudd 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 rather 

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

 ciated."— Pop?<tor Science Monthly. 



"The volume before us is one of the pleasantest science manuals we have read fcr 

 Bome iimQ.'''' —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 bes^t places and opportunities 

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

 ofit. 



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

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

 a form completely available for general readers. There is no rhetoric in his book: he 

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

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

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

 Popular Science Monthly. 



ILLUSIONS : 



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

 Intuition," etc. 12mo, cloth. $1.50. 



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

 The authors field of inquiry covers all the phenomena of illusion observed in sense-per- 

 ception, in the introspection of the mind's own feelings, in the reading of otherg' 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 

 eufflciently clear and animated to attract the general reader."— AVm; Yoi'k Sun. 



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



