INHERITANCE OF WAXY ENDOSPERM IN MAIZE. 87 
veals the fact that eight plants were the result of crossing the hybrids 
Dh 237 and Dh 234. Since these eight plants resulted in ears with a 
monohybrid ratio of white to colored seeds, we must conclude from 
the gametic formula that had they been self-pollinated they would 
have given dihybrid ratios. 
The four ears shown in Table XVII are the result of self-pollinat- 
ing second ears borne on four of the eight plants just discussed. 
The plants which as the result of self-pollination produced ears Nos. 
1132, 11383, 1721, 1741, 1748, and 1745 in Table XVI also produced 
second ears, the result of crossing Dh 237 with Dh 234. These latter 
ears were all colored. 
Twenty-nine ears were borne on first-generation plants of the hy- 
brid Dh 237 that may be compared with the monohybrid ratio of 
3 colored to 1 white. As has been said before, some of these ears are 
self-pollinated, some are crosses between sister plants, and some are 
crosses between the hybrids Dh 237 and Dh 234. In this latter cross 
only plants of the hybrid Dh 237 that were heterozygous for two 
color factors would give a monohybrid ratio of white to colored seeds 
when: crossed with the hybrid Dh 2384. 
Tt may not be immediately apparent that crosses between two 
groups of plants which when self-pollinated produce ears with 48.75 
and 25 per cent, respectively, will give ears with 25 per cent white. 
A consideration of the gametic formule shows, however, that this is 
according to expectation. All crosses with this hybrid that resulted 
in other than all-colored ears approximated 25 per cent white and 
were therefore included with the self-pollinated and pure-seeded ears 
in Table XVI. 
The 29 ears in Table XVI had a total of 16,947 seeds, with 25.4 per 
cent white, the deviation of 0.4 per cent in this case being only 1.84 
times the probable error. Two of the ears deviated in excess of 
three times the probable error, both of these being above the ex- 
pected percentage. The ears ranged from 21.6 per cent white to 
28.7 per cent white, forming a well-connected series, and since the 
range is within four times the probable error, these ears may all be 
looked upon as deviations from the theoretical 25 per cent. This reg- 
ularity is an exception to that encountered among most of our pre- 
vious hybrids and provides an excellent opportunity to study the 
correlation between endosperm texture and aleurone color in crosses 
where the percentage of white to colored seeds is behaving in a regu- 
lar manner. 
The four ears resulting from self-pollinating plants of the hybrid 
Dh 237 that were heterozygous for two factors for color are shown in 
Table XVII. These four ears had a total of 2,477 seeds, with 43.3 
per cent white. The deviation of 0.45 per cent from the expected 
percentage is less than the probable error. One ear, No. 1726, was 
