218 BACTERIAL ACTION IN THE INTESTINAL TRACT. 



urine as hippuric acid and phenaeeturic acid ; or it may find its way 

 to the liver and be re-eliminated into the intestinal tract as glyco- 

 cholic acid. 



Bilirubin is reduced to hydrobilirubin during the process of 

 intestinal putrefaction and largely eliminated in the feces as such. 

 This reduction, according to Nencki, MacFadyen, and Sieber, 

 occurs in man, in the large intestine. A portion, however, is prob- 

 ably absorbed and eliminated in the urine as urobilin. 



