ORIGIN OF CULTIVATED GRAPES. 



357 



(Specimen Shrivelled.) 



Wild Purple Grape (Shrivelled). 



Sept. 20 



1.045 16° 83.69 10.69 8.22 49.25 104.00 



The juices of the different kinds of grapes above men- 

 tioned behave quite unlike when treated With basic acetate 

 of lead, producing different colored precipitates. These 

 colors seem to result from the presence of several distinct 

 colored pigments in the grape, peculiar, in all probability, to 

 the wild species from which they originated. This re-action 

 may prove of some practical use as an aid in tracing the 

 origin of the various cultivated varieties. 



Dr. Engleman, in his excellent description of the true 

 American grape, incidentally states that some growers con- 

 sider the Delaware and Clinton as derived from the same 

 species, Vitis cord/folia, var. riparia (Gray), the common 

 frost or winter grape. This appears doubtful, judging from 

 the re-action above mentioned, and as shown in the following 

 table : — 



Wild Purple Grape 



Hartford Prolific 



Concord 



Wilder 



Ives Seedling 



Israella 



Isabella 



Clinton 



Wild White Grape "] 



Iona 



Delaware 



Charter Oak 



Eumelan 



Agawam 



Precipitate from light purple and bluish-green to 

 slate-color. 



h Precipitate from bright sulphur-yellow to cream- 

 color. 



