MODERN CONCEPTION OF PROTOPLASM. 33 
Generalising from his studies on nervous activities, Professor Gaskell 
was led to regard all life as an alternation of two processes, one of 
them a running down or disruption (katabolism), the other a winding 
up or construction (anabolism). 
All physiologists are agreed that in life there is a twofold process of 
waste and répair, of discharge and restitution, of activity and recuper- 
ative rest. But there is no certainty as to the precise nature of this 
twofold process. ; 
