A quantitative Study of Variation, Natural and Induced, etc. 213 
standard deviation and coefficient of variability, are used in the 
comparison, and the pure lines from three different mother plants, 
250—II, 250—I2, and 250—13 are given in the following table. In 
order that the table may be made as simple and as easily understood 
as possible the lines U, V, W, X, Y, and Z are taken together and 
the average of the six used in each of the three cases. The figures 
are all taken from tables No. 8, 9, Io, and Ir. 
Mother plant No. 250—11. 
Height 
Pedigree St. Dev. Coef. of Var. 
250—11 U, V,W, X, Y, and Z (averaged) 4.496 7:79 
250—II1a 4.068 5-97 
Width 
250—11 U, V, W, X, Y, and Z (averaged) 5.592 21.34 
250—Ila 3-304 9-62 
Number of Branches 
250—11 U, V,W, X, Y, and Z (averaged) 1.894 10.40 
250—I1a 1.491 7.7 
Number of Seed Pods 
250—11 U, V, W, X, Y, and Z (averaged) 27.616 29.31 
250—11a 34.880 15.61 
Mother plant No. 250—12. 
Height 
Pedigree St. Dev. Coef. of Var. 
250—12 U, V, W, X, Y, and Z (averaged) 5.000 8.68 
520—12 a 3.806 5.56 
Width 
250—12 U, V, W, X, X, and Z (averaged) 5.726 20.98 
250—12a 3.379 9.62 
Number of Branches 
250—12 U, V, W. X, Y, and Z (averaged) 1.916 10.61 
250—12 a 1.406 7-25 
Number of Seed Pods 
250—12 U, V, W, X, Y, and Z (averaged) 27.573 30.15 
250—I2a 40.126 20.00 
Mother plant No. 250—13. 
Height 
Pedigree © St. Dev. Coef. of Var. 
250—13 U, V, W, X, Y, and Z (averaged) 5.221 9.22 
250—13 a4 4-479 7.81 
