160 A Manual of Veterinary Physiology. 



potassium, iron, phosphoric and sulphuric acids ; the 

 sodium salts are always the largest. The iron, which exists 

 as phosphate, is probably derived from the haemoglobin of 

 the blood during the formation of the bile pigments. 



The following analysis of ox-bile is given by Ber- 

 zelius :* 



It is to be regretted that no complete analysis has been 

 made of bile in the horse, but the difficulties attending its 

 collection in a pure state are obvious. 



The fat present is in the form of lecithin, a complex 

 nitrogenous substance united with phosphoric acid, and 

 found in several of the tissues and secretions of the body. 



Cholesterin, another singular substance, is an alcohol and 

 not a fat, though from its appearance it has been termed 

 bile-fat. It is found in very regular quantities, and forms 



Quoted by M'Kendrick. 

 f Young, quoted by Halliburton. 



