40 
Fruits of elongata, of pentandria, and of various other forms could be 
found upon the same tree. 
A similar cross was made between 2087:16 $ and 1191:1 5 (elon- 
gata). The seeds resulting from this cross were divided into two lots 
on the basis of color and were planted as 2493 and 2494, the former 
being gray and the latter black. The resulting population in the 
case of 2493 presented 11 pistillate, 1 normal hermaphrodite of 
elongata form, 3 abnormal hermaphrodites like those described in the 
last cross, 3 males (nonfruit-bearing), and 1 hermaphroditic male. 
The individuals of 2494 were 6 pistillate, 1 male, and 2 hermaphroditic 
males. 
The above figures, representing results in sex, are to be understood 
as applying to the trees which were planted, there being in nearly 
every case many more trees than space could be found to plant. 
STOCKS NOT SHOWING ANY FERTILIZATION. 
A noteworthy fact developed in regard to the stocks of 2493 and 
2494, as referred to above. The flowers of a number of the different 
pistillate and hermaphrodite trees were hand-pollinated with pollen 
from different sources, but in every instance failed to develop. The 
pollen used in these instances was taken from the hermaphrodite 
flowers of correse, from pure staminate trees, and from hermaphrodite 
and supposed staminate plants of the elongata type. 
PARTHENOCARPY. 
Some of these trees were found to be capable of a parthenocarpic 
development of fruit. Certain pistillate flowers were covered with 
paraffined sacks to prevent pollination and developed within the sacks 
until the latter were broken by the force of growth. Such fruits were 
found to be seedless. One of these is illustrated in Plate IX, figure 2. 
A further peculiar fact is that these trees if not operated upon in 
any way received pollen from some source which satisfied their needs 
and resulted in seed production. That the failure of those hand- 
pollinated was not due to errors of technique seems certain, since the 
method and the time were the same as were used successfully in so 
many other cases with flowers of the same external structure. 
A tree in the Mount Tantalus orchard of the station was found to be 
producing seedless fruit. This is a pistillate tree of hermaphrodite 
stock. On one occasion six fruits were cut open and found to be 
without any seeds. On another occasion seven were cut open and 
all were seedless except one which contained three seeds. Several 
of the flowers were covered in paraffined sacks and were hand-polli- 
nated when the stigmas appeared to be ready for the reception of 
pollen, the sacks being again put over the flowers. Several other 
flowers on the same tree were covered with the sacks and left without 
