44 THE PHYSIOLOGY OF EARTHWORMS 



components of the oligochaete body. U-shaped curves have been 

 obtained for the susceptibility to poisons, respiratory rates, 

 sulphur content, solid content, carbon dioxide production, lactic 

 acid, oxidizable substances and electrical potential. Influence on the 

 rate of regeneration has been suggested as a function of the electrical 

 field of oligochaetes. 



I 



