AN ANALYSIS OF THE EFFECT OF SELECTION. 21 
TasLe 17.—Inbred Plus Lines Crossed. 
Generation. n M o r 
Bisse cones 192 | 5.865+0.041 | 0.824+0.029 |................. 
Ponsa ccm 689 | 5.374 .022 B10: O18 oa hae isceeeaaees 
1941 Ser ALonz. 
Biases 42 | 5.500+0.080 | 0.764+0.056 
nee 279 | 5.233 .034| 843+ .024 | 1-0.278+0.044 
Total..| 605 | 5.783 .018| .666+ .013] — .036 .027 
Fy {Plus...| 395 | 5.767 .023 | .677+ .016 |............0008. 
Minus..| 210 | 5.814 .031 | .649 .022 |................. 
Total..| 303 | 6.1164 .020] .533+ .014] + .131+ .038 
Fy {Plus...| 270 | 6.144 .022 | .5264 .015 |................. 
Minus... 33 | 5.879 .069 | .588+ .049 |................. 
1,789 
1 Does not include culture 2054, in which the mother was not-Dichet. 
10 11 
7 ve 
. J\/ 
4 4 
8 3 
ix) 
nm 
ee 1 . a 
1 2 3 4 1 2 8 
Fic. 10.—Means and standard deviations for cross of two inbred plus lines. 
Fig. 11.—Means and standard deviations for cross of 1002 inbred plus 
and speck (1331) minus lines. 
was nearly the same as that in Fj, the F.-F; and F;-F, parent-offspring 
correlations were not significantly different from 0, and the means of 
the plus and minus selected series in F; and F, were practically identi- 
cal. This constitutes practically a proof that the two lines did not 
differ with respect to modifying genes. The result, while surprising, 
is by no means highly improbable on the multiple-factor view. The 
