RELATIONS TO OTHER SCIENCES 625 



subject. It was not my intention, in the above address, to refer to all 

 the expressions of opinion on the subject, nor do the works listed 

 below by any means always hold the same position as the one estab- 

 lished in that address. They are here brought together without any 

 intention of being a complete list, but merely with the purpose to 

 furnish the reader a means of orienting himself. 



