458 
Bulletin No. 161.—1914. 
Character. 
Actual. 
Expected. 
Barred or dark. 
21 
14.5 
White. 
82 
88.5 
Totals. 
103 
103.0 
From this tabulation it is clear that there is a wide departure between 
the actual and the expected results. And when the 1914 data are 
compared with the expectations derived from this hypothesis, the 
departure is still more noticeable, since, in the case of the first 
hypothesis, there was perfect agreement. 
The experimental results for 1913 and 1914 may now be brought 
together and the data compared with the expected results obtained 
from both hypotheses. 
Results. 
1913 Matings. 
1914 Matings. 
1913- 
1914 Matings. 
White. 
Dark. 
Total. 
White. 
Dark. 
Total. 
White. 
Dark. 
Total. 
Actual. 
82.0 
21.0 
103 
52 
12 
64 
134.0 
33.0 
167 
Expected, first hy- 
pothesis. 
83.6 
19.4 
103 
52 
12 
64 
135. S 
31.2 
167 
Expected, second hy- 
pothesis. 
88.5 
14.5 
103 
55 
9 
64 
143.6 
23.4 
167 
From these data it is apparent that the number of dark colored 
birds actually obtained in the experimental matings of both 1913 and 
1914 exceeded the number called for, on the basis of the first hypothe¬ 
sis by only 1.8, while it exceeded by 9.6 the number called for on 
the basis of the second hypothesis. It is thus conclusively demon¬ 
strated that the first hypothesis best explains the phenomena observed. 
In other words, the White Leghorn carries in itself all the factors 
necessary for the production of black pigmentation in the F 2 and later 
generations of crosses with any non-black race. 
