Dec. 6,19x5 
Inheritance of Length of Pod in Certain Crosses 
417 
grown under more adverse conditions than were their second-generation 
parents. 
Table IX compares the parental and progeny pod lengths of families 
not known to throw short-podded. The averages of the progenies are 
here less than the parental averages by 3.5 mm. (See above.) 
Table IX .—Comparison of the pod length of the parents and progeny of families not 
known to throw short-podded. Third generation. Parents probably or certainly 
homozygpusfor E 
Parentage. 
Pod 
length 
of 
parent. 
Average 
pod 
length of 
progeny. 
Difference 
from parent. 
VL^:o a . 
Mm. 
82 
Mm. 
. 83 
+ 1 
VX^i 47 a . 
85 
86 
+ 1 
VT-114. 
93 
89 
“4 
VI^-255. 
97 
90 
”7 
VT-92 o. 
92 
92 
0 
TV-92. 
96 
92 
-4 
TV -558 . 
94 
95 
+ 1 
VI/-94 a . 
104 
97 
“7 
TV-27. 
103 
98 
-5 
VT-610. 
95 
99 
+4 
TV-548.. 
102 
99 
“3 
Parentage. 
Pod 
length 
of 
parent. 
Average 
pod 
length of 
progeny. 
Difference 
from parent. 
VT-102. 
Mm. 
102 
Mm. 
99 
" 3 
Vl>i 94 . 
103 
99 
- 4 
TV-569. 
104 
99 
- 5 
VT-I20 a . 
101 
100 
— 1 
VT-177 a . 
105 
101 
- 4 
VI^2 5i. 
108 
101 
- 7 x 
VL~5 i S 
104 
102 (109) 
VT ^297 0 . 
“5 
102 (no) 
VT-480. 
“3 
105 
- 8 
Average.. 
- 3 - 5 
a Fa plants not certainly known to be homozygous for E. & A black plant throwing velvet. 
To sum up, investigation of the third generation gives evidence that 
E is completely dominant; that its multiplying value is 1.5 (one family 
being an exception); that the genetic range of pod length was fully 
developed in the second generation; that the minor factors show zero 
dominance. 
FOURTH GENERATION 
The frequency arrays of fourth-generation families are given in Table 
X. By this time it was, of course, known which second-generation 
plants were Ee, and only two Ee families were grown. It was not pos¬ 
sible to select directly for long-podded plants homozygous for E , as 
selection could only be made after growing the progeny. If the minor 
factors show zero dominance, selection for specially long pods should be 
speedily efficacious. Among other desirable characters, extra length of 
pod was sought for. Hence, the chances were that most selected third- 
generation plants would be the homozygotes in their families with regard 
to minor factors. 
