44 THE GRAPE. 



THE STORES. 



The stones of grapes are remarkable as containing 

 a considerable quantity both of tannic acid and of a 

 fatty oil, the amount of which R/oy reckons at five and 

 a half million kilogrammes (1 kilo. = 2'2 pounds) 

 yearly for France alone. Koy considers that this 

 oil is as well suited for food as for burning.* Ben- 

 derf of Coblentz tried various experiments with 

 this oil. By subjecting grape-stones, en masse, to 

 pressure, he obtained 4f per cent, oil, and convinced 

 himself that the oil does not cover one-fifth of the 

 expense of pressing. Zeiraer J also extracted this oil 

 in large quantities. He obtained a greenish-yellow 

 oil, disagreeable to smell and taste, almost insoluble in 

 alcohol, possessing a specific gravity of 0*950, and 

 capable of drying very quickly if combined with oxide 

 of lead. 



Grape-stones, extracted with warm water after pres- 

 sure, yield a strong solution of tannic acid, which was 

 not removed by the previous pressure. Linderberger 

 recommends the stones themselves as colouring matter, 



* Jonrn. de Ch. Med. Janv. 1846, p. 7. 

 f- Verhandl. des Coblenzer Gew.-Vereins, 1836, s. 42. 

 J Correspondengbl. des Wiirteinberg. Landwislhsch. Vereins, 1835, 

 Bd. 1. Hefl. 3, s. 273. 



