418 HANDBOOK OF PHYSIOLOGY. 



may be used further by glands. One step, at all events, in this direction 

 has been taken ; it has been suggested that the sarco-lactic acid contin- 

 ually produced by muscle is carried to the liver, either to be converted 

 itself into glycogen, or by its influence on the hepatic cells to cause them 

 to store up that substance. 



