* 4 th ret y ' . ‘ vy 

ty 
New Yorx AaricutturaL Experment Srartion. 601 
i XII. HYBRID OF ZSTIVALIS AND LABRUSCA. 
ae Rutland. 
XIII. HYBRIDS OF VULPINA AND VINIFERA. 
_ Amber Queen. 
Canada. 
PREMERA, Vis EN filet et heat a Ce whoo el eee a Os SiGe ae ee 2 
XIV. HYBRID OF CANDICANS, VULPINA AND LABRUSCA. 
Elvicand. 
ET ROUE Mes AOI 4 det) ale AUN an lea RCRA C A SIRE RN eas NORTEL gh LEME A RAS Az 1 
XV. CULTURAL VARIETIES OF UNKNOWN PARENTAGE. 
Caywood, No. 50. 
Herald. 
Little Blue. 
Unknown (Labrusca or hybrid of Labrusca and ?) 
BOR ae a eS RUN es ens Lid Wh chy Ml dass aoe Vas: 0 hcora Aa Bek, ROD 4 
The total number of individuals in which self-pollination was 
observed is seventy-six, distributed among eight species, with 
their hybrids and crosses. Several other varieties were examined 
without being able to demonstrate that self-fertilization occurred 
before the blossoms opened, but in no case was this true, when 
buds could be found at the proper stage of development above 
noted, viz., just beginning dehiscence. In every instance when 
buds could be found in the right stage of development, it was found 
that self-pollination occurred before the cap was displaced suffi- 
ciently to allow the access of foreign pollen. 
Why Some Grapes Fail To Set Perfect Clusters. 
With the varieties of grapes named in the above list any failure 
of the blossoms to set fruit can not be attributed to lack of self-pol- 
lination. It is well known that several of these varieties when 
grown by themselves, that is, with no other variety near by, set 
fruit imperfectly, but this failure can not be attributed to a deficient 
amount of pollen produced, for in none of these varieties was a 
deficiency in the pollen supply observed. Possibly the failure 
may result from the discharge of the pollen before the stigma is 
receptive, that is, before the surface of the stigma is ready to 
‘receive it; but probably it is due to the impotency of the pollen on 
TA 

