638 Report or THE HorticvuLtTuRIst OF THE 
other varieties, shows how this variety fails to fruit under such 
circumstances. Only a few blossoms of the cluster set fruit, and 
these remained till the close of the season as withered or abortive 
specimens. Fig.4 is from a photograph of a Black Eagle cluster 
produced in a mixed vineyard, where the blossoms were exposed 
to the access of foreign pollen. At the base of the cluster appear 
a few rudimentary berries, which, for some reason, failed to 
develop, probably because they were not properly pollinated. 
Fig. 5 is from a photograph of a self-fertilized cluster of Dela- 
ware showing how perfectly this variety can set fruit when stand- 
ng alone. Fig.6 froma photograph of a Duchess illustrates 
a variety that produces imperfect and unsatisfactory clusters 
when self-fertilized. 
In order to present here some of the results of the tests of seltf- 
fertility of grapes mentioned above, an attempt has been made to 
classify the varieties according to their ability toset fruit as follows: 
Class I. Fully self-fertile apparently not more than three blos- 
soms in one hundred failing to set fruit. See Fig. 5. 
Olass II. Partly self-fertile, having rather loose clusters or a 
few abortive berries, but bunches after all being nearly perfect. 
This class may be called practically self-fertile. 
Class III. Clusters imperfect. The vines in this class were 
able to set some fruits but the clusters were usually imperfect and 
unsatisfactory. See Fig. 6. 
Class IV. Pollen self-irritant. Pollen efficient enough to in- 
cite a slight growth resulting in the production of some abortive 
berries, but no perfect fruit. See Fig. 3. 
Class V. Pollenself-impotent. In thisclassthe pollen had noappre- 
ciable effect on the pistils, not even abortive berries being formed. 
In this and the following tables the character of the stamens 
when known is indicated as follows: ‘s” indicates that the sta- 
mens are short; “1” that they are long; those intermediate 
between these two classes are mentioned in a foot-note. Where 
self-pollination before the blossom opens has been observed, this 
is indicated by an asterisk. The classification is based wholly on 
the evidence of experiments made at this Station. Further test- 
ing is considered necessary to determine the classification of 
varieties marked with a question mark. 
Class I. Grapes which are fully self fertile are named in the - 
following table. By fully self-fertile is meant that so far as ob- 
served not more than 3 per cent. of the blossoms fail to set fruit. 
