A UNIT IN AGRICULTURE 25 



lighting, (7) heating and ventilation, (8) furniture, 

 (9) environment shade, lawn, other buildings, etc. 

 Exs. 63, 64. 

 Literature. 



Farmers' Bulletins, Nos. 126, 155, 270, 317, 342. 



II. Other Farm Buildings: 



(1) number, (2) purpose, (3) location, (4) material, (5) adapt- 

 ability, (6) sanitation. Ex. 65. 

 Literature. 



Farmers' Bulletins, Nos. 32, 126, 136, 225, 227. 



IV. Maintenance of Soil Fertility. 



1. Fundamental importance of this problem. (Review work on 



soils and plant growth.) 



2. The problem involves : 



(a) The topography of the land. 



(b) The physical properties of the soil. 



(c) The chemical constituents of the soil. 



3. Means of maintaining soil fertility. 



(a) Crop rotation. 



(b) Use of fertilizers. Ex. 66, 67. 

 Literature. 



Missouri Experiment Station, Circular No. 38 (1910). 



[Best.] 



Farmers' Bulletins, Nos. 44, 77, 192, 222, 225, 245, 257, 266, 278, 

 327, 342. 



Vivian, First Principles of Soil Fertility. 



V. Improvement of Farm Animals. 



1. Determining what animals shall be grown on the farm. 



2. Importance of selecting only the best breeds. 



3. Economy in feeding the balanced ration. 



4. Study of comparative value of common foods at current prices 



