1050 
Journal of Agricultural Research 
Vol. V, No. 22 
LITERATURE CITED 
(1) Hall, A. D. 
1909. The experimental error in field trials. In Jour. Bd. Agr. [London], 
v. 16, no. 5, p. 365-370. 
(2) -and Russell, E. J. 
1911. Field trials and their interpretation. In Jour. Bd. Agr. [London] 
Sup. 7, p. 5-14, 2 fig. 
(3) Harris, J. A. 
1912. On the significance of variety tests. In Science, n. s. v. 36, no. 923, p. 
318-320. 
( 4 ) - 
1913. An illustration of the influence of substratum heterogeneity upon experi¬ 
mental results. In Science, n. s. v. 38, no. 975, p. 345-346, 1 fig. 
(s)- 
1913. Supplementary note on the significance of variety tests. In Science, 
n. s. v. 37, no. 952, p. 493 - 494 . 
( 6 )- 
1915. On a criterion of substratum homogeneity (or heterogeneity) in field 
experiments. In Amer. Nat., v. 49, no. 583, p. 430-454. 
(7) Holtsmark, G., and Larsen, B. R. 
1906. liber die Fehler, welche bei Feldversuchen durch die Ungleichartigkeit 
des Bodens bedingt werden. In Landw. Vers. Stat., Bd. 65, Heft 1/2, 
p. 1-22. 
(8) Larsen, B. R. 
1898. Om metoder for faltforsok. In Ber. Andra Nord. Landtbr. Kong. 
Stockholm, 1897, bd. 1, FcJrhandl., p. 72-84. Discussion, p. 85-94. 
(9) Mercer, W. B., and Hall, A. D. 
1911. The experimental error of field trials. In Jour. Agr. Sci., v. 4, no. 2, 
p. 107-132, 10 fig. 
(10) Montgomery, E. G. 
1912. Variation in yield and methods of arranging plats to secure comparative 
results. In Nebr. Agr. Exp. Sta. 25th Ann. Rpt. 1910/1911, p. 164-180, 
4 fig. 
(n)- 
1913. Experiments in wheat breeding: Experimental error in the nursery and 
variation in nitrogen and yield. U. S. Dept. Agr. Bur. Plant Indus. 
Bui. 269, 61 p., 22 fig., 4 pi. 
(12) Pearson, Karl. 
1904. Mathematical contributions to the theory of evolution. XIII. On the 
theory of contingency and its relation to association and normal corre¬ 
lation. 35 p., 2 pi. (Drapers 1 Co. Research Mem. Biomet. Ser. I.) 
(13) Surface, F. M., and Barber, C. W. 
1914. Studies on oat breeding. I. Variety tests, 1910-1913. Maine Agr. Exp. 
Sta. Bui. 229, p. 137-192, fig. 53-60. 
