82 



STATES OF THE RITEE PLATE. 



MiNSBALS rN THE ASH OF 



NxJTHiTrvB Constituents of Fat Mdtton. 



Albuminous or nitrogenous compounds, and sulphur, 1 proportion 10 parts 



ditto, in the flesh J 



Fat . „ 27 „ 



Wool contains: 



Hydrogen and carbon ....... 67-67 



Nitrogenous compounds 17*72 



Sulphur 24-61 



100-00 



From a study of the foregoing, it will be seen that 

 vegetable substances contain certain mineral constituents 

 in various proportions. These they draw from the earth, 

 and they are essential to the building up of the plant. 

 The other constituents are the nitrogenous compounds, 

 derived under the influence of light, heat, &c. from the 

 ammonia contained in the atmosphere ; and the non- 

 nitrogenous, the hydro-carbons, such as starch, &c. derived 



