POPULAR SCIENCE 



EVOLUTION THE MASTER KEY, 



By Dr. C. W. SALEEBY. 



Demy 8vo. Cloth extra. Price 73. 6d. [Shortly. 



A popular interpretation of the philosophy of Evolution. Dr. Saleeby 

 correlates the results of modern investigation with the principle of evolution 

 in its broadest sense, pointing out that evolution is the master key to the 

 solution of the problems of all phenomena. 



THE CYCLE OF LIFE, 



ACCORDING TO MODERN SCIENCE. 



By Dr. C. W. SALEEBY. 



Illustrated. Demy 8vo, cloth extra. Price 7s. 6d. 



An analysis of moral, physical, and social life from the scientific standpoint. 



" Dr. Saleeby is one of the few to whom it is given to write on scientific 

 subjects for a popular audience. His style is distinctly attractive; he knows 

 what he is writing about." Westminster Gaeette. 



" The author writes so well on science because he knows other things besides 

 science. A few words cannot do justice to this thought-provoking book; we 

 have read it with profit and pleasure." Academy. 



HARPER & BROTHERS 

 45, ALBEMAKLE STREET, LONDON, W. 



