CULTIVATION AND GROWTH 23 



horses. The driver rides, his chief work being to 

 guide the horses and to so regulate the machine 

 that it will plow at required depth. This is done 

 by means of a lever within easy reach of the 

 driver. In addition to the lever there is also a 

 foot lift by means of which the plow may be 

 raised entirely out of the ground. The foot lift 

 is convenient in turning at the end of the field 

 because then both hands are busy with the lines, 

 guiding the horses. Three or four acres is con- 

 sidered a fair day's work with this outfit. 



Where large wheat fields prevail, as on the 

 High Plains from Texas to Canada and in some 

 parts of California, Oregon, and Washington, gang 

 plows are used extensively. From two to sixteen 

 plows are built on one frame, the whole being 

 referred to as a two-bottom or sixteen-bottom 

 plow. The two, three, or four bottom plows are 

 usually drawn by horses or mules, while, with the 

 larger sizes, either steam, gasoline, or kerosene 

 tractors are used. In the corn belt from Ohio to 

 Nebraska, where wheat is an important crop, the 

 two-bottom gang plow is quite common. It is 

 pulled by five or six horses, driven by one man, 

 who considers five or six acres a good day's work. 

 In the High Plains country west of this region ten 

 to sixteen bottom plows drawn by great tractors 

 are a common sight. There, over large areas, the 

 wiry, panting cowboy's pony has been supplanted 



