38- 
From the data contained in the above table it is possible to draw 
some conclusions and to point to other probabilities indicated. It 
will be observed that the only pollinations which were wholly unsuc- 
cessful were Nos. 2, 3, 5, and 13. These were in every case examples 
of the use of pollen from the staminate flowers of the elongata form 
and include all such cases except the ninth class of pollination. In 
the ninth, where pistillate flowers of different individuals of No. 3198 
received such pollen, fertilization took place. This pollen was all 
taken from one tree, and the instance constitutes the only case on 
record at the station where pollen from the staminate flowers of 
elongata was successful in fertilization. It seems probable, there- 
fore, that the stamens of such flowers in most trees are infertile. In 
the earlier work on the papaya here these indications had not 
developed, and, believing the staminate to be functioning flowers, 
this elongata form was spoken of as monoecious. While the above 
results show that this was a correct supposition for at least the one 
tree from which pollen was taken to No. 3198, so many examples of 
the failure of such pollen are on record here, that, at least for the 
present, elongata must be described as usually hermaphrodite. 
A further fact brought out by the figures of the table is that certain 
individuals and stocks exhibit peculiarities of their own in relation to 
pollination. The stocks of Nos. 2491, 2493, and 2494 were not fer- 
tilized with any pollen that was applied to them, except in the case 
of 2494 : 5, which was fertilized by its own pollen within a sack. This 
individual peculiarity was not discovered in the earlier experiments 
which seemed to indicate that the seventh and the eleventh classes of 
pollinations were not successful. The later experiments have shown 
that the failure of the earlier trials was due to such peculiarities of 
stocks or of individuals. The presence of these peculiarities suggests 
great caution in generalizing, and results presented here, as in the 
case of the earlier reports, are offered merely as cumulative data. 
However, it is evident that any of the forms may be crossed. 
What the results will be in the sex characters of the offspring has been 
determined only in part. If the breeding is confined to the purely 
dioecious forms, there are, so far as the records show, no instances of 
the appearance of truly hermaphrodite forms by sudden mutations. 
Hermaphrodite flowers may appear among the staminate, thus giving 
rise to andromonoecism, as has been stated. 
COMBINING DIOECIOUS WITH HERMAPHRODITE FORMS. 
Although it is best in practical papaya culture to avoid the dioecious 
varieties for reasons that have been pointed out, it is nevertheless 
true that some of these have highly valuable characters which it 
would be desirable to introduce into a hermaphrodite form. Obvi- 
ously in any cross which is to combine in part the characters of indi- 
