ECONOMIC CLASSIFICATION OF GRASSES 13 



liquor, the alcohol being converted into acetic acid by 

 means of ferments. Besides being used for the production 

 of seed, the grasses mentioned above are extensively used 

 for forage, a use which will be discussed in a future chap- 

 ter. Corn in one of its varieties or species, sweet corn, is 

 commonly used as a vegetable, the kernels being cooked 

 when in the milk stage. Other varieties are cultivated for 

 ornament and for pop-corn. The pith of the stalks of 

 field corn has been used for many purposes, especially 

 those involving the production of pure cellulose. 



