32 PHYSICAL EXPRESSION. 



chapter we shall speak of expression in man and in 

 animals, and the illustrations of modes of expression 

 will, as far as possible, be taken from the cases of 

 living beings. The great and striking general 

 difference between the modes of expression in 

 animate and inanimate subjects, is due to the fact 

 that, in the former, vital properties and nutrition are 

 essential. 



We will commence with the study of the signs 

 of nutrition. The differences between the modes 

 of expression in animate and inanimate beings 

 is, then, due to the fact that, in the former, vital 

 properties and nutrition are essential factors. Ex- 

 pression in the living subject is usually the direct 

 objective outcome of conditions of nutrition ; we 

 therefore consider together the subject of nutrition 

 and the expression of nutrition. As to nutrition 

 per se we have very little to say here, but we are 

 deeply concerned with the modes in which nutri- 

 tion is expressed. It has been said that the most 

 certain modes of expression are those which are 

 the direct outcome of action in the parts involved ; 

 therefore the best modes of expression are the ob- 

 jective results of nutrition. Now, the results of 

 nutrition being many, it will serve our purpose to 

 deal with a few cases only growth, movement, 

 evolution, retentiveness. Growth is an objective 

 sign of nutrition a corporeal, structural, or 

 histological change in the subject; the material 

 structure of the subject, not merely its properties 

 or functions, being changed as the result or out- 

 come of this form of nutrition. Local nutrition is 



