102 R. A. EMERSON 
that there is considerably more than an even chance that they might 
have been due to errors of random sampling, P equaling 0.56. The 
comparison follows: 
Sun red, Sun red, Dilute 
Color types pink anthers green anthers sun red Green Total 
Ila Ilg IVa IVg 
Observedtsees-< 105 90 105 109 409 
Calculated. s9-2 102 102 102 102 408 
Difference........ +3 Sea : +3 aL ae 
Crosses of dilute sun red with green IVg gave 54 dilute sun red plants in 
F;, AA bbpl pl R’7’. In Fe (group 3, table 44) there resulted from a 
self-pollinated F;, dilute sun red and green plants in the relation 55:22, 
a deviation from the expected 3:1 ratio of 2.75 + 2.56. An F, back- 
crossed with green IVg gave the same two color types in equal numbers, 
30 each, exactly as expected. Numerous other crosses of this sort have 
been observed in connection with studies of the interrelations of aleurone- 
color and plant-color factors. Since these data are to be presented in a 
later paper and since they are wholly in accord with the data given in 
group 3 of table 44, they are not discussed here. 
In an earlier section of this paper dealing with the factor pairs A a, 
Bb, and Pl pl only (page 29), it was shown that the green plants there 
noted are of three kinds, namely, ab pl, a B pl, and ab Pl. Thruout 
the present section of the paper, which deals with the relation of the 
multiple-allelomorph series containing R’, 7’, R’, r’, it has been assumed 
that plants which in the presence of 7” or R’ are dilute purple or dilute 
sun red, are green in the presence of homozygous R’. The data presented 
are wholly in accord with this interpretation, thereby giving considerable 
assurance of the probable correctness of the hypothesis. The reported 
interrelations of plant color and aleurone color when the latter was known 
to involve the Rr pair, have still further strengthened this assurance. It 
remains now to present even more direct evidence, namely, that obtained 
from crosses of green plants encountered in this study, with sun red and 
dilute sun red plants. These green plants are assumed to be A b Pl R’, 
type IIIg, and A b pl R’, type IVg. 
Certain F; and F, progenies consisting of green-anthered purples and 
greens in a 3:1 relation are listed in table 39, group 4. These green plants 
