ILLUSTRATIONS xiii 



182. Erosion in Pasture Near Crest of Slope 370 



183. Old Field Erosion in Mississippi 370 



184. Old Erosion 371 



185. Brush Checking Erosion 372 



186. Headwater Erosion 372 



187. Earth-darn for Checking Erosion 372 



188. Filling a Gully by Means of a Concrete Dam 373 



189. Agricultural Provinces '. 383 



190. Wheat Growing on a Soil Very Deficient in Nitrogen 397 



191. Legumes Turned Under Have the Same Effect as the Addition of 



Nitrogen 397 



192. Wheat, 1911, Urbana Field 401 



193. Wheat, 1911, Urbana Field. Finely Ground Rock Phosphate 



Applied 401 



194. Corn on Peaty Swamp Land, 1903 404 



195. Farm Land, Value Per Acre, 1910 410 



196. Farm Property, Value, 1910 411 



197. Corn Acreage, 1909 412 



198. Corn Production, 1909 413 



199. Oats Production, 1909 414 



200. Spring Wheat Acreage, 1909 415 



201. Winter Wheat Acreage, 1909 416 



202. Wheat Production, 1909 417 



