116 DIGESTION. LECT. V. 



is incapable of fulfilling these conditions, is necessarily re- 

 jected \vith the excrements. Physicians should never forget 

 this truth, in selecting and preparing substances for admi- 

 nistration to their patients. Experience has now proved, 

 that it is by no means surprising if large doses of certain 

 inorganic salts introduced into the stomach do not produce 

 any effect; for they are rejected in the excrementitious 

 matters. 



