PLANT Cotors In Maize 75 
limited commonly to the glumes of the staminate inflorescence. Appar- 
ently the stock of green IVg, which under no environmental conditions 
to which it has been subjected has ever been observed to produce the 
slightest trace of sun red, is merely an extreme minus variation of dilute 
sun red. 
Not only were the F; results of the cross of brown with green [Vg like 
those of the cross of brown with dilute sun red, but the same major color 
types appeared in F, (table 35, page 145). The distribution of all the indi- 
viduals of six F, progenies to the six major color types heretofore recognized 
is compared below with the theoretical distribution calculated on the 
assumption that the green IVg parent was genotypically a dilute sun red, 
Ad bb pl pl: 
Color types Purple Sun red Dilute Dilute 
purple sun red Brown Green Total 
Observed . 0 0... 309 100 67 19 88 98 681 
@aleulated: 4-10: 287 96 96 32 96 74 681 
Difference EG EE +22 +4 —29 —13 —8§ +24 0 
The outstanding features of this comparison are the relatively small 
deviations, in comparison with the number of individuals, for the purple, 
sun red, and brown types, and the relatively large deviations for the dilute 
purple, dilute sun red, and green classes. The relative importance of 
the several deviations is best seen by a comparison of the quotients of 
calculated frequencies into the squares of corresponding deviations, from 
which ~ and P are derived (Elderton’s and Pearson’s tables). These 
quotients for the several classes are: 
Dilute Dilute 
purple sun red 
1.69 0.17 8.76 5.28 0.67 7.78 
Purple Sun red Brown Green 
If these quotients were no greater in the case of dilute purple, dilute 
sun red, and green than for purple, sun red, and brown, there would be 
about two chances in five that the observed deviations might be due merely 
to errors of random sampling, a fairly good fit being shown — # = 5.06, 
P=0.41. But as they stand, these deviations could be expected to occur 
thru chance alone not more than once in five thousand similar trials, a 
