544 Ret-out of the Horticulturist of the 



ment are greater than in the cases which have just been considered, 

 for not only were the tests made in different locations Lut in dif- 

 ferent seasons. Catawba, Concord, Creveling, Diamond, Duchess, 

 Eldorado, Empire State, Hartford, Lady Washington, Merrimack, 

 Pocklington, Salem and Worden gave quite similar results for 

 each variety in the different tests, thus furnishing additional evi- 

 dence that there are varieties which show little if any varia- 

 bility in the degree of self-fertility under decidedly different 

 environment. 



Clinton, Delaware, Diana, Isabella, Moore Early, Niagara, 

 Prentiss and Vergennes gave more or less variable results with the 

 same variety in the different tests and different seasons. 



Taking into consideration all varieties which have been tested at 

 the Station more than one season, it is seen that in a majority of 

 cases the same variety shows a like degree of self-fertility in 

 different seasons. In several instances the degree of self-fertility 

 varies somewhat with the same variety in different seasons, but 

 very rarely is the variation decidedly marked. 



But little has been done in comparing the degree of 'self -fer- 

 tility of vines of the same variety located in different parts of 

 the same vineyard. Such comparisons are not necessary to show 

 that the degree of self-sterility may in some varieties be modified 

 by differences in location. It has just been shown that with cer- 

 tain grapes the degree of self-fertility varies under differences of 

 environment. In some instances it is known to vary with the 

 same variety in different vineyards, with the same vine in different 

 seasons, with different clusters on the same vine and even with 

 different blossoms in the same cluster. With such variable varie- 

 ties it will without doubt vary the same season in different parts 

 of the same vineyard, for so far as soil conditions are concerned 

 different parts of the same vineyard may vary sufficiently to cause 

 marked differences in the growth and physiological conditions of 

 the vines. 



