CHAPTER XII 

 GRAIN AND HAY FARMING 



AN important and primary factor in the 

 production of all wealth is labor. 

 Aside from the professional and domestic 

 classes, the people of the world devote them- 

 selves to three forms of work : ( i ) Changes 

 in substance, or natural products; (2) 

 changes in form, or mechanical products; 

 (3) changes in place, or exchange of prod- 

 ucts. The second of these forms of work 

 gives rise to manufacturing; the third, to 

 trade and commerce. Under the first sub- 

 division two classes of natural products may 

 be recognized; first, what, for want of a 

 better name, may be called chemical 

 products, such as ores, coal and salt, from 

 which are derived mining and the metal- 

 lurgical arts; and second, vital products, or, 

 in other words, vegetation and animals. It 

 is work applied to the production of vegeta- 

 tion and animals that gives rise to agricul- 



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