GLOBULINE. MUCOSINE. 101 



What is called vegetable casein or " legumine," is different from 

 the casein of milk, aud constitutes the organic substance present in 

 various kinds of peas and beans. 



4. GLOBULIXE. This is the organic substance forming the prin- 

 cipal mass of the red globules of the blood. It is nearly fluid in 

 its natural condition, and readily dissolves in water. It does not 

 dissolve, however, in the serum of the blood ; and the globules, 

 therefore, retain their natural form and consistency, unless the 

 serum be diluted with an excess of water. Globuline resembles 

 albumen in coagulating at the temperature of boiling water. It is 

 said to differ from it, however, in not being coagulated by contact 

 with alcohol. 



5. PEPSINE. This substance occurs as an ingredient in the gas- 

 tric juice. It is not the same substance which Schwann extracted 

 by maceration from the mucous membrane of the stomach, and 

 which is regarded by Eobin, Bernard, &c., as only an artificial pro- 

 duct of the alteration of the gastric tissues. There seems no good 

 reason, furthermore, why we should not designate by this name the 

 organic substance which really exists in the gastric juice. It occurs 

 in this fluid in very small quantity, not over fifteen parts per 

 thousand. It is coagulable by heat, and also by contact with alco- 

 hol. But if the alcoholic coagulum be well washed, it is again 

 soluble in a watery acidulated fluid. 



6. PAXCREATIXE. This is the organic substance of the pancreatic 

 juice, where it occurs in great abundance. It coagulates by heat, 

 and by contact with sulphate of magnesia in excess. In its natural 

 condition it is fluid, but has a considerable degree of viscidity. . 



7. MUSCOSLSE is the organic substance which is found in the dif- 

 ferent varieties of mucus, and which imparts to them their viscidity 

 and other physical characters. Some of these mucous secretions 

 are so mixed with other fluids, that their consistency is more or less 

 diminished ; others, which remain pure, like that secreted by the 

 mucous follicles of the cervix uteri, have nearly a semi-solid con- 

 sistency. But little is known with regard to their other specific 

 characters. 



The next three organic substances are solid or semi-solid in con- 

 sistency. 



