THE RECIPROCAL INFLUENCES OF STOCK AND CION 



577 



T.\BLE 7. — Comparison of Composition op Grapes on Riparia and on St. George 



(After BiolettP^) 



Variety 



Stock 



Riparia Gloire 



Sugar Acid 



Riparia Grande 

 Glabre 



Sugar Acid 



St. George 



Sugar Acid 



Valdepenas . . . 



Zinfandel 



Gros Mansene 



Fresa 



Vernaccia. . . . 

 Marsanne. . . . 

 Chardonay. . . 



Sultana 



Cornichon. . . . 



Moan 



27.5 

 26.5 

 24.1 

 25.6 

 27.5 

 23.3 

 25.0 

 24.0 



0.65 

 0.92 

 1.20 

 0.92 

 0.84 

 0.50 

 0.60 

 0.75 



26.7 

 24.0 

 27.6 

 25.0 



22.8 



20.3 



0.77 



0.80 



24.4 



0.86 



23.5 

 24.0 



24.2 

 21.6 



22.7 



0.56 

 0.85 



0.61 

 0.62 



0.75 

 0.65 



0.67 



(lata which, when contrasted with the growth ratings of the same vines 

 based on observations and measurements of growth during the same 

 growing seasons, indicate that there is a close correspondence between 

 these important chemical constituents of the fruit and the congeniality 

 of graft and stock as determined by observation of growth. Similar rat- 

 ings of the growth of a variety grafted on various stocks are found to be 

 accompanied by fairly definite percentages of sugar and acid. Under 

 like conditions of growth the sweetness and acidity of the fruit, as well as 

 its time of ripening, are evidently materially influenced by the congeni- 

 ality of the graft and stock." 



This is of considerable importance. It indicates that the congeniality 

 of the graft is influential rather than the stock and that the same stock 

 may with one variety increase the sugar content and with another 

 decrease it. 



Qualitative Differences and Quantitative Variations. — Since com- 

 position, ripening and keeping quality of fruits are more or less related, 

 an effect produced on one of these implies an effect on the others. It 

 was stated, many years ago, that there was a month's difference in the 

 keeping quality of Hubbardston apples grown on Hightop Sweet and on 

 Roxbur}' Russet in the same soil and with the same culture. Rhode 

 Island Greening on Hightop Sweet was said to be only a fall variety. The 

 crab stock of England made the Golden Pippin keep longer than did 

 the free stock. Daniel,^* who states that Labrusca stock has a rather 



