LEADERS IN SCIENCE SERIES. 



I2MO, FULLY ILLUSTRATED. EACH, $1.50 



I. — The Life and Work of Charles Darwin. By 



Charles F. Holder. 



Mr. Holder is one of the American savants who have made Darwin 

 and his system of philosophy a subject of profound study, and his book 

 relating to him is one of the best that has been produced for popular use." 

 — Philadelphia Bulletin. 



"The author has given us a capital account of Darwin's voyages, 

 adventures, and discoveries indicating in broad outlines his theories and 

 scientific opinions, and not neglecting lo throw into strong light the 

 lovable personal character and individual traits of the great naturalist." 

 — Christian Union. 



The work is particularly attractive in the elaborate picture it gives 

 of the man, the sweetness and purity of his life, the simplicity of his 

 nature, the loftiness of his aim, and the patient and unswerving de- 

 votion to the tasks he had set himself to accomplish. It is a book that 

 may be commended without reserve, and the stjde in which it is written 

 enhances the charm of what it has to tell." — Boston Gazette. 



"The sketch of this life is just, sympathetic, and brief— three good 

 points in a biography." — Springfield Republican, 



II. — The Life and Work of Louis Agassiz. — By 



Charles F. Holder. 



III. — The Life and Work of Alexander Humboldt, 



By F. GuiLLEMARD. (In preparation.) 



G. P. PUTNAM'S SONS, New York and London. 



