WESTER: POLLINATION EXPERIMENTS WiTH ANoNAS 53] 
insects.* (In individual trees of the cherimoya the apical end of 
of the petal is curved outward, though not to the extent of facili- 
tating the conveyance of pollen to the stigma.) As the time ap- 
proaches for the discharge of the pollen, the petals spread out 
and upward so rapidly that the movement is readily perceived; 
this phenomenon is accompanied by the exhalation from the 
flower of a fragrance analogous to that of a well-ripened banana 
4 
Ficure 1. Flower of the cherimoya, showing position of petals when the 
stigmas are in the receptive state. (One third natural size. 
or pineapple in the cherimoya and custard apple; in the sugar 
apple it partakes of the odor of ethyl acetate and continues for a 
few hours until the pollen is shed, after which it disappears and 
the petals wither. The fragrance is also noticeable in the flowers 
twenty-four hours previous to the shedding of the pollen and is 
undoubtedly intended to serve as a guide for insects that aid in 
the pollination. The stigma is now readily approached by large 
as well as small insects and were the stamens and stigmas syn- 
chronous self-pollination by insects or the wind might be effected 
(FIGURES 2 and 3)). 
as it is very evident that the flowers are 
*This expression is used advisedly, 
will appear presently. 
not constructed for wind pollination nor are self-pollinized, as 
