6g6 THE POPULAR SCIENCE MONTHLY. 



ries of addresses and arguments on the claims of scientific education 

 by more than twenty English and American thinkers. The editor 

 was represented in the list by a lecture on " The Scientific Study of 

 Human Nature" and an introductory essay on "Mental Discipline in 

 Education,*' in which he attempted to show that a course of study 

 mainly scientific not only meets the full requirements of mental train- 

 ing, but also affords the kind of culture or mental discipline especially 

 needed in this country. 



Besides his labors as a lecturer and in the preparation of h's own 

 works, and his efforts in behalf of Mr. Spencer's publications, Professor 

 Youmans had all along been deeply interested in the reproduction here 

 of the works published abroad by the leaders of modern scientific 

 thought. Among the earliest which he urged the Appletons to repub- 

 lish were those of Whewell, Buckle, Darwin's " Origin of Species," 

 and the writings of Spencer and Tyndall. He went to England sev- 

 eral times on this errand, and, as a result of his exertions, the works 

 of Huxley, Lubbock, Darwin, Lyell, Bain, Tyndall, Maudsley, Sully, 

 Hinton, Bastian, Roscoe, Simpson, Proctor, Helmholtz, Bagehot, Mill, 

 Carpenter, Mattieu Williams, and many others, were reprinted by the 

 Appletons, and have been very popular w r ith thoughtful readers in 

 this country. The arrangement with the publishers was that the au- 

 thors should be paid a publisher's copyright at the customary Ameri- 

 can rate. 



Chiefly interested in the works of scientific and philosophical 

 authors, who suffer most from lack of international copyright be- 

 cause their productions are in comparatively small demand, Professor 

 Youmans planned the "International Scientific Series," and spent a 

 year in Europe making arrangements for it with authors and pub- 

 lishers. After not a little hard labor, the series was finally organized 

 on the basis of simultaneous publication in London, New York, Paris, 

 Leipsic, Milan, and St. Petersburg, and of payment to the authors on 

 the sales in all countries. The first volume, issued in 1872, was Tyn- 

 dall's "Forms of Water," and was followed by Bagehot's suggestive 

 work on " Physics and Politics." Other books that attracted atten- 

 tion to the merits of the series were Cooke's "New Chemistry," Spen- 

 cer's " Study of Sociology," Draper's " History of the Conflict between 

 Religion and Science," and Schmidt's " Doctrine of Descent and Dar- 

 winism." The series has reached, in Mr. Angclo Heilprin's "Geo- 

 graphical and Geological Distribution of Animals," its fifty-seventh 

 number, and as a whole constitutes the most successful popular pres- 

 entation of scientific and philosophical ideas ever attempted. None 

 of the books have enjoyed a wider circulation than the " Study of So- 

 ciology "and the "Conflict between Religion and Science," both of 

 which are remarkable for the boldness of their statements of new 

 ideas. It thus appears that the foreign authors whose works were in 

 charge of Professor Youmans have been for years in practical enjoy- 



