1 82 



SWINE IN AMERICA 



"In the next column the same rotation is outhned on 

 Field B, but the clover comes a year earlier, having been 

 seeded down with grain in 1902. It will be observed thr.t 

 grain comes on Field B in 1906, with which to sow clover 

 for pasture in 1907, and that each of the four fields in 

 the rotation is kept in a regular course, each doing its 

 part in producing each kind of crop in its turn. On Field 

 C, in like manner, the same rotation prevails, each crop 

 coming a year earlier than in the field before, grain 

 having been grown here in 1901 and clover seeded with 

 it. Again, in Field D, rye, fodder corn and rape come in 

 1903, the wheat and clover having been sown in 1900. 



"The chart marks out a four-year period beginning 

 with (say) 1903, the earliest year when all the changes 

 preliminary to introducing the full course will have been 

 completed. During the preceding three A^ears, 1900, 



TABLE II SEVEN-YEAR ROTATION FOR HOG PASTURAGE, 



SHOWING PRELIMINARY YEARS 



