240 . PHYSICAL EXPRESSION. 



CHAPTER XIV. 



EXPRESSION OF MIND IN THE INFANT AND ADULT. 



Materialistic questions only entertained The criteria of mind,, 

 what are they? Physical study of signs of mind from 

 infancy upwards A subjective condition is only known 

 to us by its physical expression Brain properties necessary 

 to mentation Impressionability Retentiveness Relation of 

 outcomings to afferent stimulus Comparison of an infant 

 with the adult, and an idiot with a healthy child Description 

 of an infant; its development and signs of potentiality 

 Impressionability: its attributes; delayed expression of im- 

 pressions Modes of expression are criteria of mind Ex- 

 pression of distress Memory Subjective conditions studied 

 by their expression Thought. 



THE physiologist and the physician, dealing in 

 their work only with things material, must of 

 necessity seek for realistic methods of investigation 

 and description. We have not here to consider any 

 metaphysical properties of mind, but, putting aside 

 all such considerations, it is our business at present 

 to consider only the realistic, objective, physical 

 signs by which the physical investigator may judge 

 of the presence of what is called mind. 



What are to be taken as the criteria of mind or 

 the faculty mentation ? We leave this question to 

 be partially answered in the course of this chapter. 



