294 Edward Livingston Youmans. 



tween Religion and Science, Josiah Cooke's New 

 Chemistry, and Spencer's Study of Sociology. This 

 last book was written at Youmans's suggestion, to 

 prepare the public for the Descriptive Sociology 

 which appeared in after years. The Study has passed 

 through eleven English editions, and has proved nearly 

 as popular as its author's Education. 



It was unavoidable that in a programme so lengthy 

 some of the co-operators should drop out of the ranks. 

 My dear friend Clifford died before he had more than 

 outlined his proposed work, The Principles of Exact 

 Science explained to the Unmathematical. Prof. Je- 

 vons contributed Money and the Mechanism of Ex- 

 change, and a second volume was expected from his 

 pen at the time of his drowning. Our editor had to 

 face other difficulties in the execution of his task than 

 those due to mortality. When some of the contribu- 

 tions came in they proved too bulky or too technical 

 for inclusion and had to be rejected. There was not a 

 little grumbling in America at first at the fewness of 

 American contributors, but this died out as the list 

 gradually took up one after another name of authority 

 at home. 



