CHANGE PRODUCED BY FERTILIZATION. 353 



new plant, and the varied compositions may be accompanied 

 by certain physiological changes which shall determine the 

 character of the variety. 



A more certain and direct method of producing new varie- 

 ties by hybridization may be opened if we know positively 

 the chemical composition of the varieties used as parents, 

 or if we can, as indicated by the above and many other 

 striking illustrations, bring about the desired changes in the 

 most essential parts. If we select the varieties for crossing 

 in which the most desired elements are accurately known to 

 exist, is it not probable that wc shall have better success 

 than if we worked in the ordinary way? 



To obtain correct information in relation to the natural 

 condition of the wild seedling, healthy vines were selected, 

 growing near a pond in the vicinity, and rooted layers trans- 

 planted to the experimental plots in the college vineyard. 

 Both the white and purple varieties of Vitis Labrusca (£.) 

 were used. Fruit was collected for analysis from the origi- 

 nal vine, which had received no fertilizer; while those trans- 

 planted to the vineyard were fertilized with Fertilizer No. 1 

 from the time of their removal. The fertilizers used were 

 a hundred and eighty pounds of potash nitre and four 

 hundred and fifty pounds of superphosphate of lime, con- 

 taining twelve per cent of soluble phosphoric acid. The 

 transplanted vines yielded fruit the second year after trans- 

 planting. 



The analysis given below was confined to the determina- 

 tion of the constituents of the solid organic matter, the 

 sugar, and the free acid. 



[A.] 



