MODERN CONCEPTION OF PROTOPLASM. 33 



the other tending to explosion, disruption, disassimila- 

 tion. 



Generalising from his studies on nervous activities, Pro- 

 fessor 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 repair, of discharge and restitution, of 

 activity and recuperative rest. But there is no certainty as 

 to the precise nature of this twofold process. 



