320 LOCK : STUDIES IN PLANT BREEDJNG 
the experiment being thus in the closest agreement with 
Mendel’s chief deduction from his experiments with peas. 
Example V ,—The blue colour of the aleurone layer, 
appearing in certain strains of Indian corn, seemed at first 
sight to afford an exception to the law of segregation of 
allelomorphs in equal numbers.* This blue colour appeared 
in certain members of the above strain of flint corn in varying 
degrees of intensity. The present experiment was made 
with blue xenia grains appearing in the same way as the 
original yellow grains used in Example IV. A. number of 
these blue grains were sown upon the same plot as the yellow 
grains in question, and pollination was, therefore, effected 
from the same extracted récessives, viz., white flint. 
Twelve resulting cobs showed the following proportion of 
blue and non-blue (W) grains :— 
No. 
B. 
W. 
Total. 
Per Cent. B, 
1 
156 
244 
400 
39 
2 
118 
311 
429 
27-5 
3 
108 
302 
410 
26-4 
4 
143 
440 
583 
24*6 
5 
74 
234 
308 
24 
6 
78 
256 
334 
23-4 
7 
88 
293 
381 
23*1 
8 
125 
425 
550 
22*7 
9 
86 
308 
394 
21*8 
10 
73 
262 
335 
21-8 
11 
87 
356 
443 
19-7 
12 
70 
286 
356 
19*6 
Altogether 3,717 white grains and 1,206 blue, or 24*5 per 
cent, of the latter. It appears, therefore, that if “ blue were 
fully dominant, the gametes of the heterozygote must have 
been formed in the proportion 3 white to 1 blue, instead of 
in equal numbers. If, on the other hand, there is really 
segregation of the characters in equal numbers in the gametes, 
some of the white grains must be heterozygotes, since these 
must then make up half the total number of grains, and in 
* Cf. also Correns (15). 
t the appearance of a visible blue colour of any intensity. 
