PLANT CoLors IN MAIZE 81 
five (P equaling 0.58), and for the colorless seeds only about one chance in 
fourteen (P equaling 0.07), that the observed deviations may be due to 
errors of random sampling. The comparisons follow: 
Dilute Dilute 
Color types Purple Sun red ame simned Brown Green Total 
Ta Ila Illa IVa V_séiAIllg, IVg, VI 
Colored seeds: 
Observiedeuasessay 148 ~ 51 25 8 0 23 255 
Calculated.......... 143 48 32 11 0 21 255 
Difference as. 5) .ee +5 +3 —7 —3 0 +2 0 
Colorless seeds: : 
Observedacessksn. 161 49 42 11 88 75 426 
Calculated.......... 136 45 39 13 104 89 426 
Difference.......... +25 +4 +3 —2 —16 —14 0. 
It is noteworthy that the ratio of purples and sun reds to dilute purples 
and dilute sun reds is considerably greater for plants grown from colored 
seeds than for those from colorless seeds. This is to be expected from 
the fact that R must be present in all colored seeds, while some of the 
colorless seeds here concerned were doubtless rr. Hence, R’ R’ should 
have occurred more frequently in the colored than in the colorless seeds, 
and should, by the hypothesis here under test, have reduced the numbers 
of dilute purples: and dilute sun reds, causing these plants to appear as 
greens, types IIIg and IVg. If the 23 green plants grown from colored 
seeds are added to the dilute purples and dilute sun reds, the ratio of 
strong to dilute purples and sun reds approaches closely the ratio observed 
for the plants from colorless seeds. 
It is even more instructive to note the relation of aleurone color to plant 
color in the case of the three F2 lots for which anther colors were recorded 
(table 36, page 146). For this comparison the few purple and sun red 
plants whose anther colors were not recorded have been distributed to 
the colored-anther and green-anther classes in approximately the ratio 
in which these anther colors were found to occur in the cases in which anther 
colors were recorded. Since a larger proportion of colorless than of colored 
seeds produced plants, the theoretical distribution has been calculated 
separately for the two classes of seeds. The comparisons follow: 
