108 LESSONS IN CHEMISTRY. 



152. Composition in \000 parts of the urine of man:- 



1000-0 



153. The solid excrements of a man, according to the 

 analysis of BerzeHus, had the following composition : — 



Water 733 



Albumen, and other animal matters . 185 



Saline matters 12 



Undecomposed food . . . . 70 



1000 



154. When dried, the sohd excrement contained, in 1000 

 parts, 132 of inorganic matters, which had the following 

 composition : — 



Carbonate of soda .... 8 

 Sulphate of soda, with sulphate of potash, 



and phosphate of soda ... 8 

 Phosphate of lime and magnesia, and traces 



of gypsum . . , . 100 



Silica 16 



132 



The matter, therefore, discharged from the body, like the 

 food, and the bone and muscle which it forms, is a mixture 

 of organic and inorganic substances. The liquid excrements 

 especially, being rich in compounds of Nitrogen, and being 

 characterized by containing urea\ — a substance which, by 

 the decomposition that mine, when discharged from the 



* The name Lactic acid, or acid of milk, is given to the acid formed 

 in sour milk, in the fermentation of the juice of the Turnip, and in the 

 souring of the grains of the Distillery. 



f Urea contains nearly 47 per cent, of nitrogen. 



