14- Earthquakes. In the Light of the New Seismology. By CLARENCE 

 E. DUTTON, Major, U. S. A. Illustrated. 8. Net, $2.00. (By 

 mail, $2.20.) 



" The book summarizes the results of the men who have accomplished tne great 

 things in their pursuit of seismological knowledge. It is abundantly illustrated and i| 

 fills a place unique in the literature of modern science." Chicago Tribune, 



15. The Nature of Man. Studies in Optimistic Philosophy. By ELIE 

 METCHNIKOFF, Professor at the Pasteur Institute. Translation and 

 introduction by P. CHAMBERS MITCHELL, M.A., D.Sc. Oxon. Illus- 

 trated. 8. Net, $2.00. 



"A book to be set side by side with Huxley's Essays, whose spirit it carries a step 

 further on the long road towards its goal." Mail and Express. 



16. The Hygiene of Nerves and Mind in Health and Disease. By 



AUGUST FOREL, M.D., formerly Professor of Psychiatry in the Uni- 

 versity of Zurich. Authorized Translation. 8. Net, $2.00. (By 

 mail, $2.20.) 



A comprehensive and concise summary of the results of science in its chosen field. 

 Its authorship is a guarantee that the statements made are authoritative as far as the 

 statement of an individual can be so regarded. 



17. The Prolongation of Life. Optimistic Essays. By ELIE METCH- 

 NIKOFF,' Sub-Director of the Pasteur Institute. Author of " The 

 Nature of Man, "etc. 8. Illustrated. Net, $2.50. (By mail, $2.70.) 



In his new work Professor Metchnikoff expounds at greater length, in the light of 

 additional knowledge gained in the last few years, his main thesis that human life is not 

 only unnaturally short but unnaturally burdened with physical and mental disabilities. 

 He analyzes the causes of these disharmonies and explains his reasons for hoping that 

 they may be counteracted by a rational hygiene. 



18. The Solar System. A Study of Recent Observations. By Prof. 

 CHARLES LANE POOR, Professor of Astronomy in Columbia University 

 8. Illustrated. Net, $2.00. 



The subject is presented in untechnical language and without the use of mathematics. 

 Professor Poor shows by what steps the precise knowledge of to-day has been reached and 

 explains the marvellous results of modern methods and mo'dern observations. 



19. Climate Considered Especially in Relation to Man. By ROBERT 

 DfiCoURCY WARD, Assistant Professor of Climatology in Harvard 

 University. 8. Illustrated. Net, $2.00. 



This volume is intended for persons who have not had special training in the tech- 

 nicalities of climatology. Climate covers a wholly different field from that included in 

 the meteorological text-books. It handles broad questions of climate in a way which has 

 not been attempted in a single volume. The needs of the teacher and student have been 

 kept constantly in mind. 



20. Heredity. By J. ARTHUR THOMSON, M.A., Professor of Natural 

 History in the University of Aberdeen ; Author of " The Science of 

 Life," etc. 8. Illustrated. Net, $3.50. 



The aim of this work is to expound, in a simple manner, the facts of heredity and 

 inheritance as at present known, the general conclusions which have been securely 

 established, and the more important theories which have been formulated. 



21. Age, Growth, and Death. By CHARLES S. MINOT, James Still- 

 man Professor of Comparative Anatomy in Harvard University, 

 President of the Boston Society of Natural History, and Author of 

 " Human Embryology," " A Laboratory Text-book of Embryology," 

 etc. 8. Illustrated. 



This volume deals with some of the fundamental problems of biology, and presents 

 a series of views (the results of nearly thirty years of study), which the author has 

 correlated for the first time in systematic form. 



