406 
Journal of Agricultural Research 
Vol. V, No. 10 
grown were selected with the aim of obtaining useful agricultural plants. 
A fairly complete third generation was raised, but the fourth generation 
was the result of selection and was the opposite of a random sample. 
qualitative investigation 
The Florida velvet bean (Stizolobium deeringianum) was crossed both 
ways with the Philippine Lyon bean (S. niveum). A pertinent descrip¬ 
tion of these plants has been given in my account of the inheritance of 
semisterility (4). The Florida velvet bean has a short pod (PI. XL, fig. 
B), while the pod of the Lyon bean (PI. XL, fig. C) is about half as long 
again and is broader. The pods of the first-generation hybrid plants 
were as long as, or slightly longer than, those of the Lyon. The progeny 
of the hybrids in the second generation could be divided by inspection 
into short-podded plants and long-podded plants. The short pods could 
be identified, even when young, by their greater proportional width. 
Although both short pods and long pods varied greatly in size on different 
second-generation plants, yet no case was met with where the classifi¬ 
cation could not be carried out when all the pods on a plant were taken 
into account. Plate XL, figures A and shows typical pods of second- 
generation plants with pods shorter than the Florida velvet bean and 
longer than the Lyon bean pods. The difference between short and 
long pods was sharply marked in all the segregating third-generation 
families. 
Tables I, II, and III give the results of field inspection, checked by 
examination of the pods after harvesting. 
Table I. —Length of pods in first-generation bean crosses 
Parentage.® 
Number of plants with— 
Dong pods. 
Short pods. 
Florida velvet bean X Lyon bean. 
7 
Lyon bean X Florida velvet bean. 
6 
Total. 
13 
a The pollen parent is given last throughout this article. 
Table II. —Length of pods in second-generation bean crosses 
Parentage. 
Progeny ratio. 
Calculated ratio. 
Deviation. 
Probable 
deviation. 
Florida velvet bean X 
Lyon bean. 
Lyon bean X Florida vel¬ 
Long. 
140 
Short. 
' 49 
Long. 
141. 75 
Short. 
: 47-25 
-i -75 
4. O 
vet bean. 
375 
: 120 
371-25 
: 123.75 
+ 3 - 75 
6-5 
Total. 
515 
: 169 
513 
: 171 
+2. O 
7.6 
