Nov., 1923] 
DORSEY — STERILITY AND HORTICULTURE 
483 
bearing on the whole orchard program this field needs further intensive 
investigation. 
An attempt has been made in the preceding discussion to survey the 
general question of fruit-setting and to evaluate the different factors which 
have a bearing upon it. It will be seen that these can be assigned to three 
general causes each of which although influenced by the other may become 
the dominant consideration. The total effect of these in reducing the crop 
can best be appreciated by those familiar with reduced yields and crop 
failures. The investigations in some phases of the problem have gone no 
farther than to emphasize the need of further work. The fact that fruit 
for the most part is produced under such variable conditions will of necessity 
make the set uncertain. There are certain factors, however, some favorable 
to fruit-setting and some unfavorable, which may be regarded as fixed or 
constant in their relation to fruit-setting. While the investigations in this 
field have gone far toward devising means of stabilizing the industry, much 
more remains to be done. 
West Virginia University, 
Morgantown, W. Va. 
LITERATURE CITED 
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