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. 



