100 THE ESSENTIALS OF AGRICULTURE 



3. Make a plan showing the location of the barnyard and feed-yard 

 with a view to the conservation of manure and to the convenience 

 of feeding. 



4. How many farmers in the neighborhood use manure-spreaders, 

 and how many spread the manure as it is produced ? How many 

 allow it to accumulate under the eaves of the barn ? 



REFERENCES 



HOPKINS, C. G. Soil Fertility and Permanent Agriculture, chap. xxx. 



Ginn and Company. 

 ROBERTS, J. P. The Fertility of the Land, chap. viii. The Macmillan 



Company. 

 SNYDER, HARRY. Chemistry of Soils and Fertilizers, chap. v. Chemical 



Publishing Company. 

 THORNE, C. E. Farm Manures, chaps, iv-viii, and x. Orange Judd 



Company. 

 VAN SLYKE, L. L. Fertilizers and Crops, chaps, xvii-xviii. Orange Judd 



Company. 

 VIVIAN, A. First Principles of Soil Fertility, chaps, xi-xv, and xvi. Orange 



Judd Company. 



WHEELER, H. J. Manures and Fertilizers, chaps, iii and v. The Mac- 

 millan Company. 

 Barnyard Manure, Farmers' Bulletin 192, United States Department of 



Agriculture. 



