36 
in the case of L. dioica that the eggs can not transmit the hermaphro- 
dite character to the male offspring. This character can be carried 
only through the pollen. 
" Among the offspring of genetic hermaphrodites/' he continues, 
"were a small number of male mutants, which on breeding proved 
to be normal males." In the case of 2355 referred to (see p. 34) there is 
one male mutating from the hermaphrodite form and much has been 
said of hermaphrodites* appearing as mutants from ordinary males. 
Such sex mutants appear to occur not infrequently in the papaya. 
BREEDING WITHIN THE ANDROMONCECIOUS FORMS. 
Very limited experience has been afforded in crossing hermaphro- 
dite flowers of the correse form from trees of different origin. In one 
instance such a cross was made, resulting in several pistillate trees, 
a few staminate, and many hermaphrodite of the elongata form out 
of 73 trees in all. This is interesting evidence which would appear 
to indicate that elongata and correse differ only in degree. 
Another result of this cross is worthy of note. One of the pistillate 
trees of this progeny produces an ovary and a resulting fruit very 
closely resembling those of elongata form (PI. X, fig. 2), which would 
again indicate that this shape of ovary is not necessarily confined to a 
hermaphrodite flower. 
CROSSING THE DIFFERENT FORMS. 
POSSIBILITIES AND LIMITATIONS. 
It may often be desirable to combine the characters of individuals 
of the different forms. To test the possibilities of pollinations, seven- 
teen different combinations of pollen and stigma have been tried. 
The table (p. 27) shows the number of cases in which each of these 
combinations was tried in the experiment and the number of suc- 
cesses resulting. The results of pollination, designated in the sec- 
ond column as "successful" and "unsuccessful," will show at a glance 
whether any successes have been attained in any particular cross. 
Some of the successful pollinations have been repeated many times 
since the close of this specific experiment. It should be stated also 
that the pollinations on any given tree were not made in a single day, 
usually not more than one flower being available on any one day. 
This reduces the influence of- weather conditions which also were 
chosen as favorably as possible. The usual precautions were taken 
to prevent the access of pollen other than that designated. Emascu- 
lation was practiced where required and flowers covered with cotton 
sacks which had been immersed in warm paraffin. 
