INTRODUCTION xxv 



Most of all there is the vigorous and genial personality 

 of a man who was not merely a scientist, nor even merely 

 a seeker after truth in itself, but who felt the need of re- 

 lating all knowledge to human life, who approved the 

 English pre-occupation with religion and politics, and 

 who turned more and more as years went on from pure 

 science to broader fields of interest. 



