536 WeEsTER: POLLINATION EXPERIMENTS WITH ANONAS 
to this act, though here, as in the case of the cherimoya, the 
tree shed much of the fruit before it matured owing to its inability 
to carry it all. In September twenty-five pollinations of flowers 
on a sugar apple tree were made, in accordance with the theory of 
proterogyny, all successful. In order to verify the observations 
already made in regard to the pollinization and fertilization of the 
flowers of the species, over 100 flowers were pollinated on three 
trees in April and May, 1910, the results confirming the conclu- 
sions already made. 
The pollination experiments with the custard apple in 1908 
were conducted on three trees. In the course of these experiments 
154 flowers, pollinated twenty-four hours before the discharge of 
the pollen in the flower, all, with few exceptions, set; 104 flowers, 
pollinated at the time of its discharge, all dropped. 
The writer has in the course of his work with the Anonas in a 
very few instances noted that individual trees subjected to ap- 
parently the same conditions as others less fruitful were exceed- 
ingly prolific and from the results obtained in these investigations 
concluded that this was possibly due to synacmy and self-pollina- 
tion. In order to obtain some information on this point with respect 
to the pond apple and to ascertain whether the pollination of the 
flowers of this species conformed to the same laws as those of its 
cultivated congeners, a series of experiments was carried through 
during April and May this year. Sixty-two flowers were bagged, 
in order to exclude all foreign pollen; none of these set. Fifty-six 
flowers were pollinated with pond apple pollen eighteen or more 
hours before the discharge of the pollen, and seven with pollen 
of the sugar apple and the cherimoya, with the result that sixty 
flowers were fecundated. The pollination of the flowers of this 
species thus appears to be analogous to that of its cultivated 
congeners. 
The flowers of the pond apple, which belongs to the section 
Guanabant Martius, have six distinct, glabrous, concave, fleshy, 
outwardly yellowish white petals, in two series, the exterior being 
25 to 40 mm. long, marked with red near the base inside, the 
interior smaller and red within except for a narrow transverse 
yellowish band near the base, the arrangements of the androecium 
and gynoecium being similar to those in the Affae. The flowers 
