FIBER CROPS 



323 



The lint is not pure cellulose, but contains also small quanti- 

 ties of protein, the remnant of the living cell and some ex- 

 tractive matter. The fat probably is absorbed from contact with 

 the seed. The seed is characterized by its high content of 

 protein and fat in which regard it is somewhat similar to the 

 seeds of three other cultivated but somewhat minor crops, 

 namely, flax, peanut, and soy bean. The following table shows 

 the maximum and minimum protein and fat content as deter- 

 mined by American analyses for the air-dry seeds of these four 

 plants : 



Table Showing Protein and Fat in Seeds of Four Plants 



414. Ash. The following table shows the ash constituents 

 in the whole plant, seed and lint : 



Table Showing Ash Content of Cotton 



