4 PHYSICAL EXPKESSION. 



I think the detailed and experimental method of 

 studying movements in the body, and their causes, 

 may throw much light upon the laws and pro- 

 cesses of nutrition and evolution. It was a part 

 of my original plan to deal in this volume with 

 some of the laws of nutrition; but, as the work 

 advanced, it seemed better to defer dealing with 

 this subject, as also with regard to some evidence 

 as to the forces at work in producing brain evolu- 

 tion in the individual : * so here we deal with 

 the principles and modes of expression of hidden 

 conditions as a matter preliminary to other 

 studies. 



Inasmuch as these studies were primarily under- 

 taken as an attempt to discover the physical signs 

 of the brain conditions which lead to the potentiality 

 for moral, and intellectual character, it is not sur- 

 prising that they led to the study of the physical 

 signs of the brain conditions giving capacity for 

 "mind."t Still, I was unwilling here to enter upon 

 the physical study of mind, and have dealt only 

 with certain matters preliminary thereto. 



In dealing with the phenomena of mind, the 

 present work is a preliminary stepping-stone ; if we 

 observe and analyze all physical phenomena coinci- 

 dent with the manifestation of mind, we may obtain 

 data for studying the action of the physical causes 

 aiding the development of mind. This method of 

 procedure appears to me more likely to lead to 

 practical results than any subjective process of 

 introspection of the feelings. 



* See chap. xvi. f See chap. xiv. 



