INTRODUCTION 



Vll 



wisdom of thousands of men, all thinking of the same problem, 

 and each doing his little bit to add to the great structure of knowl- 

 edge which is gradually being erected." 1 



1 "Background to Modern Science," The Macmillan Co. (N.Y.) and the Uni- 

 versity Press (Cambridge, Eng.) 1936. 



"Books must follow sciences, and not sciences books." — Sir Francis 

 Bacon, "Of Studies". 



