TJic Apostle of Evolution. 147 



and that it was on the list of books recommended by him 

 to the students. For myself, I consider it a real accession 

 to my library, and renew my thanks for it with thrice their 

 first cordiality. And so, my dear sir, I have the pleasure 

 of signing myself, Your truly obliged friend, 



O. W, Holmes. 



Soon after rewriting the Chemistry, Youmans pub- 

 lished, under the title of The Correlation and Con- 

 servation of Forces, a collection of monographs by 

 Faraday, Grove, Liebig, Carpenter, and Mayer, with 

 an introduction by himself. This introduction is an 

 able condensed statement of the modern doctrine of 

 forces, with its pregnant implications for the guidance 

 of life. The book was just what people needed, and 

 it had a very large sale. 



As a consequence of his visit to England, Y^ou- 

 mans had been instrumental in having the Appletons 

 reprint the principal works of Bain, Huxley, Tyndall, 

 and other men of mark. It became part of his daily 

 task to do what he could to bring these volumes 

 suitably before the public. In this he was much 

 helped by his wide acquaintance throughout the 

 country among teachers and others interested in the 

 spread of science. Wherever he knew a competent 

 reviewer he sought his aid in connection with the 

 local press. In New York his journalistic relations 

 were such as to insure the widest circulation for the 

 reviews he himself wrote. These were usuallv anal- 

 yses clearly bringing out the positions of an author, 

 adducing the arguments in support of his conclusions. 

 This was exactly the kind of work he liked and ex- 

 celled in. The results attending the faithful work of 

 himself and his allies, performed as it was in the midst 



