46 LUTHER BURBANK 



danger of a nitrogen famine, and the developer 

 of plants no less than the consumer of plant prod- 

 ucts may look forward without apprehension, so 

 far as the danger of the starvation of plants for 

 lack of nitrogen is concerned. 



But the mechanical processes of nitrogen fix- 

 ation are necessarily expensive, and the aid of 

 the clovers and their allies will no doubt continue 

 to be sought for a long time to come by the 

 agriculturist who wishes to restore nitrogen to 

 his fields in the most economical manner. 



The first crop of clover is usually cut for hay, 

 and a second crop used to turn under in the fall 

 to fertilize the soil. Thus this plant occupies a 

 unique place among farm products. It not only 

 supplies a valuable forage food, but it also helps 

 the farmer to keep his land in a condition of 

 perennial fertility. 



There is nitrogen, worth millions of 

 dollars, in the air over every farm 

 in America and by the simple 

 process of raising inoculated 

 legumes, we can extract and em- 

 ploy it not only without expense, 

 but at the same time producing 

 crops of unusual profit. 



