IN THE BILE. 59 



of the transformed organs are collected in the uri- 

 nary bladder, and being utterly incapable of any 

 further application in the system, are expelled from 

 the body. 



Those, again, which contain the carbon of the 

 transformed tissues, are collected in the gall-bladder 

 in the form of a compound of soda, the bile., which is 

 miscible with water in every proportion, and which, 

 passing into the duodenum, mixes with the chyme. 

 All those parts of the bile which, during the diges- 

 tive process, do not lose their solubility, return 

 during that process into the circulation in a state of 

 extreme division. The soda of the bile, and those 

 highly carbonised portions which are not precipitated 

 by a weak acid (together making T^ths of the solid 

 contents of the bile), retain the capacity of resorp- 

 tion by the absorbents of the small and large intes- 

 tines; nay, this capacity has been directly proved 

 by the administration of enemata containing bile, 

 the whole of the bile disappearing with the injected 

 fluid in the rectum. 



Thus we know with certainty, that the nitrogen- 

 ised compounds, produced by the metamorphosis of 

 organised tissues, after being separated from the 

 arterial blood by means of the kidneys are expelled 

 from the body as utterly incapable of further altera- 

 tion ; while the compounds rich in carbon, derived 

 from the same source, return into the system of 

 carnivorous animals. 



The food of the carm'vora is identical with the 



