MANURE. 183 



218. The above substances, which form the great bulk of 

 animals, and no small part of plants, deducting their inor- 

 ganic elements, compose proteine, whose constituents are : 



Carbon, 55.742 



Hydrogen, G.827 



Nitrogen, 16.143 



Oxygen  21.288 



100.00 



This compound is the basis of the animal solids, and soft 

 parts : fibrine, or flesh, and albumen, are only compounds of 

 this, with sulphur and phosphorus. All the parts of the 

 animal frame are modifications only of proteine. 



The peculiar principle of glue, or size, or jelly, called gela- 

 tine, never exists in the healthy animal body. It is the pro- 

 duct of catalysis. Boiling water is the catalytic agent, and 

 produces it from tendon, ligament, cartilage, skin and bone. 

 The composition of these will show at once their relation to 

 proteine : 



Scherer. 



Horny matter is equally allied to proteine. Its several 

 variations have been divided into two classes : 1st, soft, and 

 2d, compact. The first includes skin, or the outer part, 

 called cuticle; and the delicate lining membrane of the 

 internal passages, and sacs ; and these substances are like 

 constituted. The cuticle of the sole of the foot is composed 

 of— 



