NUTRITION. 235 



of their continuity, of their permanence, of their 

 activity, and of their slackening. Living matter is 

 always growing, much or little, slowly or quickly, 

 in its reserve-stuff or in its protoplasm, for expenditure 

 or accumulation. This inevitability of growth defines 

 it, characterizes it, and sums up its activity. Develop- 

 ment and the evolution of growth are consequences or 

 aspects of nutrition. 



