420 
CECIL YAMPOLSKY 
flower appeared on the tip of one of the lateral branches of one of the plants. 
It was in all respects like the female flowers on the female plant. No 
other female flowers were produced. Two weeks later the two seeds were 
collected as they appeared to be mature. The plant began noticeably to 
lose its vigor, and in the middle of May it died. It had produced two seeds. 
It is impossible to count the number of male flowers produced during the 
life of such a plant. Male flowers appear usually three weeks after the 
germination of the seed. With the increase in the size of the plant there is 
an increase in the number of male flowers. On a healthy, vigorous, growing 
male I have computed that over 25,000 male flowers may appear at one 
time. This I did by stripping a male plant of all its flowers, weighing all 
of them, and then determining the number of flowers in several one-gram 
lots. The total weight in grams multiplied by the average number of 
flowers per gram gives a rough estimate of the number of flowers upon a 
plant at one time. 
A second plant of the twelve behaved in the same way as the first. 
Two flowers were observed, one with two carpels, the normal condition, 
the other with only one carpel. The two flowers appeared separately 
on the ends of lateral branches. The ovaries began to swell shortly after 
they were discovered, but through a faulty manipulation they fell off before 
becoming mature. No more female flowers were produced, and the plant 
died in May. Both the plants were eleven months old at the time of their 
death. The other 10 male' plants failed to produce any female flowers, 
and by May they had all died. 
The 2 seeds collected from the first plant were placed in soil that was 
previously sterilized. Within nine days one of the seeds had germinated. 
The other seed proved to be non-viable. Three weeks after germination 
the sex of the seedling was determined to be male. The plant continued to 
develop. It lived ten months without producing a single female flower. 
Male Cultures from seeds of Female X Male Parentage 
100 seeds, presumably from females pollinated by males, secured from 
the Brooklyn Botanic Garden, were sown in March, 1915. 67 germinated, 
and of these 36 were males and 31 were females. The male plants were 
isolated and grown in individual pots. None of the plants was vigorous 
at any time. Only one of the 36 plants produced female flowers and seeds. 
In May, two and one half months after sowing, the plant began to develop 
female flowers. Four such flowers were produced. Three of these flowers 
bore two carpels each; the fourth had only one. The ovaries began to 
swell, and two weeks later 7 seeds were collected. The seeds appeared to 
be weak and sickly. By July all the plants were discarded because of their 
very poor condition. The 7 seeds failed to germinate. 
As was noted earlier, plant no. XXVIII, a seven-months-old female 
