226 



AGRICULTURAL CHEMISTRY 



with sulfuric acid to oxidize the organic matter and con- 

 vert the nitrogen into ammonium sulfate (see Fig. 81). 



Fig. 82. Distillation apparatus used in the determination of nitrogen. 



The nitrogen, in the form of ammonium sulfate, is then 

 liberated as free ammonia, distilled and its amount deter- 

 mined (see Fig. 82). 



Albuminoids 



308. Composition of Albuminoids. This term is 

 applied to a class of bodies resembling proteids, but 

 differing from them in composition and food value. 

 Albuminoids are found in both animal and plant bodies, 

 but more abundantly in animal tissues. Some albumi- 

 noids are composed of carbon, hydrogen, nitrogen, and 

 oxygen, while others contain, in addition, phosphorus, 

 sulfur and other elements. 



309. Nuclein is an albuminoid found in both plant 

 and animal bodies ; it is the material of which the nuclei 

 of cells are composed, and has been separated from milk, 

 the yolk of egg, and white blood corpuscles, as well as 



