New York AGRICULTURAL EXPERIMENT STATION. 523 
perfect or nearly perfect clusters and also some that were quite 
imperfect. It. appears therefore that while tests with one or two 
clusters may generally give a good indication of the condition of 
a variety they are not extended enough to be received as conclusive. 
Indeed some kinds of grapes show much variability in the charac- 
ter of their self-fertilized clusters on the same vine, although the 
average results of the variety with different vines and in different 
tests are quite similar. In addition to the instances of the Rogers 
hybrids which have just been cited, detailed results in two other 
cases of this kind will be given as illustrating this feature in cer- 
tain variable grapes. In 1897 9 clusters of Antoinette were. cov- 
ered during the blooming season. Three produced perfect clusters 
of fruit, 8 were almost perfect, 2 were rather loose and 1 formed 
no fruit. Had only the last-named cluster been tested Antoinette 
might have been listed as a self-sterile variety. Twenty-two clus- 
ters of Vergennes were tested at Penn Yan in 1897. Two clusters 
formed no fruit. The other twenty averaged about half filled, 
varying from the very loose and imperfect clusters shown in Plate 
- XLIX, Figure 2, to the nearly perfect cluster, which is shown in 
Figure 1. | 
Seasons and localities— From a consideration of these results 
and others which will be presented on following pages it is clear 
that not only should more than one vine be included in tests of 
self-fertility, but the tests should be made in more than one sea- 
son and under diverse conditions of soil and climate. This has 
not yet been done with all of the varieties which are included in 
these experiments. Of the 169 cultivated varieties under investi- 
gation but 78 have been tested by the writer in more than one 
season and only 24 in more than one locality. 
METHODS OF RECORDING OBSERVATIONS. 
When the fruit of uncovered clusters was nearly or quite full 
grown each covered cluster was examined. Whenever any fruit 
was found a record was made of the proportion of blossoms which 
