1088 EXCRETION 



may also be present in amounts equalling 1.5 per cent, of the total 

 nitrogen.^ Aromatic oxyacids, such as phenol, indoxyl and skatoxyl, 

 are normally present in varying amounts, and serve as an indication 

 of the putrefactive decomposition of the proteins in the large intestine. 

 Ordinarily, the body protects itself by oxidizing them and combining 

 them to sulphuric acid to form the ethereal sulphates. 



1 Van Slyke and G. M. Meyer, Jour. Biol. Chem., xvi, 1913, 197. 



