A BRACHYTIC VARIATION IN MAIZE. 
23 
character in half the cases. In this particular cross also the spikes 
were unusually well developed. (See Table IV.) 
BRACHYTIC X HOPI. 
The Hopi variety, in common with other varieties grown by the 
Indians of the Southwestern States, possesses the long mesocotyl, 
which permits deep planting. An attempt was made by crossing 
brachytic and Hopi to combine the brachytic stature with the deep- 
planting adaptation. The strain of Hopi used in this cross was par- 
ticularly vigorous, with plants fully as tall as those of the Boone 
variety. 
The first generation was a complete surprise and was practically 
worthless. The plants were tall but differed from all the other first- 
generation hybrids of which brachytic was one parent in that they 
were weak and soon lodged. The ears were small and the yield poor. 
Table IV. — Distribution of plants with respect to the staminate spike characters 
in the brachytic X Boone and brachytic X Hopi hybrids of maize, including 
plants of the first and second generations. 
Normal 
stature. 
Brachytic 
stature. 
Total. 
Percentage. 
Bra- 
chyt- 
ic. 
Stami- 
nate 
spikes. 
Coefficient 
of asso- 
ciation. 1 
Progeny designation. 
Nor- 
mal 
ears. 
Ears 
with 
<$ 
spikes. 
Nor- 
mal 
ears. 
Ears 
with 
spikes. 
Brachytic X Boone: 
Dh 436 W2 L19, F 2 
39 
51 
48 
21 
20 
18 
16 
27 
18 
7 
5 

83 
103 
84 
27.7 
31.0 
21.4 
33.8 
24.3 
21.4 
0. 10±0. 20 
Dh 435 AVI L19, F 2 
.45±0. 17 
Dh 436 Wl L19, F 2 
1.0 ±0 
Total 
138 
59 
61 
12 
270 
27.0 
26.3 
.37±0. 112 
Dh 436 Fi 
63 
71 
20 
17 
3 
2 
80 
95 
22 
23.2 
21.3 
13.7 
9.1 
Brachytic X Hopi: 
Dh 438 Wl L19, F 2 
11 
10 
.91±0. 04 
Dh438F! 
i The correlations are between normal stature and staminate spikes with the exception of the last one, 
which is a correlation between brachytic stature and staminate spikes. 
The second generation was little better, and no good plants were 
found. The brachytic plants especially were poor, one-half of the 
plants having ears which terminated in the staminate spikes found in 
the brachytic-Boone hybrids and described on pages 20-22. In the 
Hopi hybrid, however, the staminate spikes were much longer in pro- 
portion to the length of the pistillate part. The magnitude of this 
difference between the pistillate and staminate parts is shown in 
Table V. In the other hybrids the staminate spikes on the ears of 
brachytic plants were no longer than those borne on sister plants of 
normal stature. The ears with staminate spikes in the Hopi hybrid 
contrasted sharply with the normal ears, and no gradations were 
found. In this respect they differed from the Boone hybrids, where 
