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SUICIDE: An Essay in Comparative Moral Statistics. By HENRY 

 MORSELLI, Professor of Psychological Medicine in the Royal Univer- 

 sity, Turin. 12mo. Cloth, $1.75. 



u Suicide " is a scientific inquiry, on the basis of the statistical method, into the lawa 

 of suicidal phenomena. Dealing with the subject as a branch of social science, it con' 

 eiders the increase of suicide in different countries, and the comparison of nations 

 races, and periods in its manifestation. The influences of age, sex, constitution, cli' 

 mate, season, occupation, religion, prevailing ideas, the elements of character, and th6 

 tendencies of civilization, are comprehensively analyzed in their bearing upon the pro- 

 pensity 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. JUDD, Professor of Geology in the Royal School of Mine's 

 (London). With Ninety-six Illustrations. 12mo. Cloth, $2.00. 

 " In 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 inquiry converge upon the grand problem of the interior 

 constitution 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 facts and laws with which volcanic phenomena 

 are associated/' Popular Science Monthly. 



THE SUN. By C. A. YOUNG, Ph. D., LL. D., Professor of Astronomy 

 in the College of New Jersey. With numerous Illustrations. 

 Third edition, revised, with Supplementary Note. 12mo. Cloth, 

 $2.00. 



The " Supplementary Note " gives important developments in solar astronomy 

 since the publication of the second edition in 1882. 



" 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; he trusts the grandeur of his theme to kindle interest and impress the feelings. 

 His statements are plain, direct, clear, and condensed, though ample enough for his 

 purpose, and the substance of M'hat is generally wanted will be found accurately given 

 to his pages.'' Popular Science Monthly. 



ILLUSIONS : A Psychological Study. By JAMES SULLY, author 

 of " Sensation and Intuition," etc. 12mo. Cloth, $1.60. 



This volume takes a wide survey of the field of error embracing in ita view not only 

 the illusions commonly regarded as of the nature of mental aberrations or hallucina- 

 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 

 scientific treatment that is to say, the description and classification of acknowledged 

 errors, and the exposition of them by a reference to their psychical and physical con- 

 ditions. 



" This is not a technical work, but one of wide popular interest, in the principles 

 and results of which every one is concerned. The illusions of perception of the senses 

 and of dreams are first considered, and then the author passes 10 the illusions of in- 

 trospection, errors of insight, illusions of memory, and illusions of belief. The work 

 is a noteworthy contribution to the original progress of thought, and may be relied 

 upon as representing the present state of knowledge on the important subject tc 

 which it is devoted." Popular Science Monthly. 



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