New York Agricultural Experiment Station. 549 



alone. Plate L shows what was left of covered Enmelan clusters 

 at the time the fruit ripened on the uncovered clusters. It is seen 

 that not a fruit developed when the Eumelan was compelled to 

 depend on itself for setting fruit. Herbert and Barry likewise 

 fail to fruit when dependent on their own blossoms for pollina- 

 tion. Brighton does but little better. The best results which its 

 covered clusters gave in these investigations are the three clusters 

 shown in Plate LI, Figure 1. But self -sterile varieties may produce 

 well formed clusters when located near enough to other kinds of 

 grapes so that cross-pollination can occur. The clusters of Her- 

 bert and Barry shown in Plate LIII, and that of Brighton shown 

 in Plate LI, Eigure 2, were borne on vines which were located 

 favorably for cross-pollination. 



The varieties which are named in Classes 1 and 2 produce well 

 formed clusters of themselves. The covered clusters of Duchess 

 and Diamond illustrated in Plate LI I show what perfect clusters 

 may develop on varieties in these classes when the blossoms are 

 self-pollinated. The varieties named in Classes 1 and 2 may there- 

 fore be planted alone without reference to cross-pollination. 



DATES OF BLOOMING. 



The following table is given in order to assist in determining 

 what varieties may be used for cross-pollinating the varieties which 

 are named in Classes 3 and 4. It shows the dates of blooming for 

 vines in the Station vineyards only. Where but one date is given 

 it shows when the first blossoms opened. The second of two dates 

 shows the close of the blooming period. 1 



l The grape usually continues in bloom from six to ten days after the first 

 blossom opens. The time from the opening of the first blossom till the vine 

 comes into full bloom, that is to say, till a large proportion of the clusters are 

 blooming, varies according to temperature conditions. If the weather be 

 warm, it may not take more than from twenty-four to forty-eight hours. 

 If the weather be cool, it will take a correspondingly longer time. The con- 

 ditions of temperature, therefore, determine largely the length of the period 

 of bloom. Millardet has shown that it is the temperature and not the degree 

 of light which influences the rapidity of anthesis of the grape. Anthesis 



