LITERATURE CITED. 
(1) Beeson, M. A., and Adrian Daane. 
1919. Darso. Okla. Agr. Exp. Sta. Bui. 127, 19 p., 6 fig. 
(2) Chilcott, E. C, and J. S. Cole. 
1915. Subsoiling, deep tilling, and soil-dynamiting in the Great 
Plains. In Jour. Agr. Research, v. 14, p. 481-521, 4 fig. 
Literature cited, p. 521. 
(3) Cole, John S. 
1922. Drv farm crop production in eastern New Mexico. X. Mex. 
Agr. Exp. Sta. Bui. 130, 32 p., illus. 
(4) Conner, A. B., and R. E. Dickson. 
1921. Spur feterita, Tex. Agr. Exp. Sta, Bui. 275, 28 p., 14 fig. 
(5) Dillman, A. C. 
1916. Breeding millet and sorgo for drought adaptation. L T . S. Dept. 
Agr. Bui. 291, 19 p., 2 pi. 
(6) Edwards, R, W. 
1916. Progress report of Substation no. 12, Chillicothe, Texas, 190-";- 
1914. Tex. Agr. Exp. Sta. Bui. 202, 30 p., 13 fig. 
(7) Getty, R. E. 
1921. Forage crops in western Kansas. Kans. Agr. Exp. Sta. Bui. 
225, 54 p., 10 fig. 
(8) Rothgeb, Benton E. 
1916. Dwarf broom corns. U. S. Dept, Agr., Farmers' Bui. 768, 
16 p., 7 fig. 
(9) 1918. Standard broom corn. U. S. Dept. Agr., Farmers' Bui. 958, 
20 p., 7 fig. 
(10) 1922. Cultural experiments with grain sorghums in the Texas Pan- 
handle. U. S. Dept. Agr. Bui. 976, 43 p., 11 fig. 
(11) Sieglinger, John B. 
1923. Grain-sorghum experiments at the Woodward Field Station in 
Oklahoma. U. S. Dept. Agr. Bui. 1175, 65 p., 14 fig., 7 pi. 
(12) Vinall, H. N., and R. E. Getty. 
1921. Sudan grass and related plants. U. S. Dept, Agr. Bui. 9Sl r 
68 p., 25 fig. Literature cited, p. 67-68 
(13) and Roland McKee. 
1916. Moisture content and shrinkage of forage and the relation of 
these factors to the accuracy of experimental data. U. S. 
Dept, Agr. Bui. 353, 37 p. 
(14) and H. R. Reed. 
1918. Effect of temperature and other meteorological factors on the 
growth of sorghums. In Jour. Agr. Research, v. 13, p. 133 
148, pi. 11-12. Literature cited, p. 147. 
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