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610 Report oF THE HORTICULTURIST OF THE 
presumably of self-pollination, only one fruit, bearing three seeds | 
was borne by the tree. This was produced about midway between 
that half, more heavily wet down and that more nearly dry. The 
unsprayed tree produced a fair crop of normal fruit. 
EXPERIMENT witH DucHEss GRAPE. | 
Two vines situated near each other were selected for this 
experiment. One was left untreated for a check, the other was 
sprayed for twelve nights and days. Since the Duchess came into 
blossom later than was anticipated, the sprayed vine was under 
treatment a week before the check began to bloom. Unavoidably 
the spray was discontinued before either of the vines were out of 
blossom. It will, therefore, be seen that the twelve days’ treat- 
ment did not cover the entire period that the vines were in bloom. 
Effect on blossoming.— The first apparent effect of the spray was 
to retard the opening of the grape blossoms four days, as compared 
with the blossoming of the check vine. This effect was noticeable 
during the blossoming period, and the treated vine continued in 
blossom at least four days longer than the check. Retarding the 
blossoming period, however, had no perceptible influence on the 
ripening of the fruit, for the fruit of both vines ripened at the 
same time. i 
Effect on foliage.— After a few days’ treatment the sprayed vine | 
assumed a paler and less healthy color, but before the close of the — . 
season it was impossible to detect any difference in the two vines ~ 
in this regard. ! 
Effect on pollen.— A microscopic examination made after the 
spray had been running eleven days failed to disclose any percepti- 
ble injury to the pollen. The pollen germs were not disintegrated 
nor had they germinated, and no difference could be detected — 
between them and pollen grains from the check vine. LBy its pecu- — 
liar structure the grape blossom is well adapted to withstand pro- — 
tracted rains without injury to the sexual organs. As shown by — 
one of the writers in a recent paper,* many grapes pollenize their 
own stigmas before the blossoms open sufficiently enough to allow — 7 
the entrance of outside pollen, and the Duchess belongs to this . 
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* Notes on self-pollination of grape, read before the Rochester, N. Y., meeting of the A. AY on . 
A.S., August 22, 1892. ee 
