The Chemical Constituents of the Organism. 17 



ance are regularly found about the cerebellum and in the 

 ventricles ; they form the substance of perhaps the majority 

 of tumours seen in the brain of the horse. Cholesterine is 

 also found in the wool of sheep united to a potash soap termed 

 lanolin. The origin of cholesterine is unknown. Ethyl 

 alcohol has been found in the muscles of the ox and horse. 



Glycerin is found in fats, and, as previously mentioned, 

 is liberated from them in the intestinal canal by the fat- 

 splitting ferment of the pancreas ; it has been supposed that 

 the glycerin formed in the body contributes to the forma- 

 tion of glycogen. 



Phenol, or carbolic acid, is largely formed in the intestinal 

 canal of herbivora, due to the decomposition of proteid 

 food the result of pancreatic digestion. It passes out of 

 the body by the urine, united with sulphate of potash or 

 combined in some way with sulphuric acid. This is the 

 type of a number of bodies termed conjugate sulphuric 

 acids, which are excreted by the urine, and to an extent 

 form a measure of the amount of proteid decomposition 

 occurring in the digestive canal. 



Of the Fatty or non-nitrogenous organic acids there are 

 several found in the animal body, such as formic, acetic, 

 propionic, butyric, caproic, palmitic, and stearic. Acetic 

 may be present in the digestive canal ; propionic and butyric 

 have been found in sweat, and as the latter acid is connected 

 with lactic fermentation, it may be found wherever this is 

 occurring. The palmitic and stearic acids have been noticed 

 under the fats. 



Several acids relating to the Glycollic Series are found in 

 the body, the most important being lactic acid which is 

 found in two or three different forms. It may occur in the 

 stomach and muscles, and also results from fermentative 

 changes in milk. The origin of muscle lactic acid is from 

 glycogen or glucose. 



The Oxalic Acid Series furnishes oxalic and succinic acids 

 as occurring in the body. The oxalate of lime is common 

 in herbivora, and results from the ingestion of vegetable 

 food containing oxalates, also, perhaps, it is formed in the 



9 



