Drainage and Larger Crops. 457 



7, Drainage reduces greatly the heaving of soil and the conse- 

 quent injury to winter crops. 

 The principles and practice of drainage are explained in the following 

 publications to which the reader may refer if further information is 

 desired : 



1. Engineering for land drainage. C. G. Elliott. John Wiley & 

 Sons, New York. This is less technical in its treatment than may be 

 inferred from its title. 



2. Land Drainage. Many Miles. Orange, Judd Co. 



3. Physics of Agriculture. F. H. King. Orange, Judd Co. 



4. Irrigation and Drainage. F. H. King. Macmillan Co. 



5. Draining for profit and Draining for health. G. E. Waring. 

 Orange, Judd Co. 



6. Cyclopedia of American Agriculture. Vol. L Macmillan Co. 



7. Farmers' Bulletin 187. Drainage of farm land. U. S. Depart- 

 ment of Agriculture, Washington, D. C. Free. 



