Seientifie Publications. 
‘IDE : An Essay in Comparative Moral Statistics. By Henry Morsexui, Pro- 
mae of Peyanalogtcal Motticine in Royal University, Turin, 12mo, Cloth, $1.75, 
“ Suicide ” is a scientific inquiry, on the basis of the statistical method, inte the laws 
of suicidal phenomena, Dealing with the subject as a branch of social science, it con- 
siders the increase of suicide in different countries, and the comparison of nations, 
races, and periods in its mani i The infl of age, sex, constitution, cli- 
mate, season, occupation, religion, prevuiling ideas, the elements of character, and the 
fendencies of civilization, are comprehensively analyzed in their bearing upon the pro- 
ppensity to self-destruction. Professor Morselli is an eminent European authority on 
this subject. It is accompanied by colored maps illustrating pictorially the results of: 
statistical inquiries. 
‘VOLCANOES: What they Are and what they Teach. By J. W: Jupp, 
Professor of Geology in the Royal School of Mines (London). With Ninety-six 
Illustrations. 12mo. Cloth, $2.00. 
“Tn no field has modern research been more fruitful than in that of which Professor 
Judd gives a popular account in the present volume. The great lines of dynamical, 
geological, and meteorological inguiey, converge upon the grand problem of the interior 
constitution of the earth, and the vast influence of eubterranean agencies... . Kis 
book is very far from being a mere dry description of volcanoes and their eruptions ; it 
is rather & presentation of the terrestrial facts and laws with which volcanic phenomena’ 
ssociated.”"—Popular Sci one 
“The volume before us is one of the pleasantest science manuals we have read for 
some time.”—Athengwum. 
“Mr, Judd’s summary is so full and so concise that it is almost impossible to giva 
a fair idea in a short review."—Pali Mall Gazette. 
THE SUN, By C.A. Youne, Ph. D., LL. D., Professor of Astronomy in the College 
of New Jersey. With numerous litustrations. 12mo. Cloth, $2.00. 
“Professor Young is an authority on ‘The Sun,’ and writes from intimate knowl- 
edge. He has studied that grect luminary all his life, invented and improved instru- 
ments for observing it, gone to all quarters of the world in search of the best places 
and opportunities to watch it, and has contributed important discoveries that have 
extended our knowledge of it. 
“Tt would take a eyolopredia to represent all that has been done toward clearing u 
the solar mysteries. Professor Young has summarized the information, and presente, 
{t in a form completely available for general readers, There is no rhetoric in his book; 
he trusts the grandeur of his theme to /xindle interest and impress the feelings. His 
statements 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 his 
pages.” —~ Popular Science Monthly. 
ILLUSIONS: A Psychological Study. By Jams SuLty, author of “ Sensa- 
tion and Intuition,” eto. Iino. Cloth, $1.50. 
This volume takes a wide survey of the fiold of error, embracing in its view not only 
the illusions commonly regarded as of the nature of mental aberrations or haliucina- 
tions, but also other illusions arising from that capacity for error which belongs essen- 
tially to rational human nature. The author has endeavored to keep to a strictly scien- 
tific treatment—that is to say, the description and classification of acknowledged errora, 
and the exposition of them by a reference to their psychical and physical conditions. 
“This is not a technical work, but one of wide popular interest, in the principles and 
results of which every one fs concerned. The illusions of perception of the senses and 
of dreams are first considered, and then the author passes to the illusions of introspec 
tion, errora of insight, illusions of memory, and illusions of belief. The work is 2 note- 
pee cone ibation to Pere progress of tbovents and a bs relied upon as 
enting the present s of Knowledge on the important subject ich it i 
devoted."—Popular Science Monthly. - B pe ee nee ie 
D. APPLETON & co., Publishers, 
1, 3, and 5 Bond Street, New York. 
