424 
CECIL YAMPOLSKY 
sex of the individual plants became apparent. The 7S seedlings were all 
male plants. The plants as they grew were transferred to larger pots, so 
as to insure them the maximum growth. 
The plants were watched carefully and examined for female flowers. 
It was thought that perhaps the offspring of plant no. 247 would exhibit 
the tendency of the parent plant. Not one of the 31 ofifspring produced a 
single female flower or a single seed. Toward the middle of September, 
six months after germination, plant no. 241 produced a female flower, and 
two weeks later two seeds were collected, one of which was much smaller 
than the other and appeared undeveloped. Plant no. 244 produced a 
female flower in the beginning of October, and eleven days later two seeds 
were collected. In this case, too, one of the seeds was much smaller than 
the other. Four seeds were collected from the 75 plants. The plants 
lived from five months to a year. All, however, produced functional 
pollen, judging from its microscopical appearance. 
Table 7. Germination of Seeds from Male Plants 
Plant 
Number of Seeds 
Number Germinated 
Percentage 
Sex 
238 
14* 
4 
28.7 
239 
7 
3 
43-0 
240 
5 
0 
241 
16* 
4 
25.0 
242 
5 
I 
20.0 
& 
243 
3 
I 
33.3 
& 
244 
4 
I 
26.0 
& 
245 
5 
2 
40.0 
247 
83* 
31 
37.7 
248 
4 
2 
50.0 
249 
8* 
2 
25.0 
250 
8 
2 
25.0 
252 
4 
I 
25.0 
253 
3 
0 
254 
13* 
4 
30.7 
& 
255 
3 
I 
33.3 
& 
256 
2 
I 
50.0 
258 
2 
I 
50.0 
& 
259 
II 
I 
9.0 
275 
I 
I 
lOO.O 
d^ 
276 
2 
2 
100.0 
d^ 
277 
2 
I 
50.0 
& 
278 
10 
5 
50.0 
d^ 
300 
I 
I 
100.0 
cf 
325 
I 
I 
100.0 
d^ 
326 
I 
I 
100.0 
328 
I 
I 
100.0 
& 
Total 
219 
75 
34-2 
Total 
* I seed split seed coat but failed to develop further. 
Germination of Seeds from Fi Generation 
The two plump seeds and the two undeveloped seeds were sown. Both 
of the plump seeds germinated and produced seedlings, both of which proved 
to be males. Both lived to be six months old but they failed to produce 
any seeds. 
