New YorK AGRICULTURAL EXPERIMENT STATION. 381 
of the pistil to which it is applied. The one fruit which de- 
veloped when Black Kagle pollen was tried upon Bailey easily 
falls within the limits of error for such an operation, and can- 
not be considered as proof that the fertilization was in fact 
effected by the Black Eagle pollen. But in the cases where 
Ozark and Hexamer were tried upon Hopkins, as well as in 
instances which might be selected from the tests listed in 
Tables II and IV, it appears that some varieties which, so far 
as tested, have proved self-sterile are to some extent capable 
of fertilizing other varieties. This is an indication that their 
pollen finds its own pistils less congenial than those of certain 
other varieties. It is hoped that further investigation of these 
questions may be made. 
Il. INFLUENCE ON SELF-FERTILITY OF GIRDLING OR 
BENDING THE FRUITING CANES. 
In making the tests reported in Bulletin No. 169, to determine 
whether some varieties of grapes are better than others for fer- 
tilizing self-sterile kinds, two instances were observed in which 
self-fertility seemed to be increased on canes which had been 
bent so much as to obstruct the flow of sap. These varieties 
were normally nearly self-sterile. In tying the vines upon the 
trellis some fruiting canes had been bent so sharply that the 
transfer of elaborated food from the part beyond the bend was 
necessarily checked. It was noticed that a little fruit developed 
on self-pollinated clusters borne on the distal part of such canes, 
while none or almost none was borne by corresponding clusters, 
either on other parts of the same canes or on other canes on the 
same vine. These observations suggested the question whether. 
in cases of imperfect self-fertility the fruitfulness might not be 
increased by treating the fruiting canes in some way to increase 
the supply of elaborated food available to the developing essen- 
tial organs of the blossoms. In order to gain information on 
this subject, some experiments were conducted in 1901 and 1902, - 
in which the transfer of elaborated food from the fruiting cane 
to the supporting branch or vine was checked either by girdling 
the cane just beyond its first node or by bending or twisting it 
