305 



ON DIFFERENT SPECIES OF SUGAR. 



subject, that be considers the accelerative and moving forces 

 of a body as the same thing. 



I am, Sir, 



Your humble servant, 

 Cambridge, 24th Nov. 1808. S. VINCE. 



Some of the hj'potheses which have been invented to ac- 

 count for gravitation are so fraught with absurdity, that it 

 was not thought necessary even to state them. 



XIIT. 



An Essay on the Sugar of Grapes; Jy Professor Proust*. 



Grapes contain JL HE grape presents us with a sugar of a new species, the 



a disimctspe- existence of which had hitherto been suspected only in con- 

 cies of sugar. ... r j 



junction with those sweet and agreeable substances, that are 



known to form the basis of the flavovir of our fruits. Be- 

 fore I proceed to the examination of this product, the mode 

 of extracting it, its qualities, and the uses to which it may 

 be applied, it will be proper to lay down some general prin- 

 Order of the ciples respecting sugar. We mvist first distinguish its spe- 

 inquiry. ^.-gg^ ^g]^g ^ ^j^^ ^f ^Yie substances that usually accompany 



it, and examine which of the latter it is essentially necessary 

 to separate from it, in order to apply it to our use, and 

 which may be suffered to remain without any sensible dimi- 

 nution of its qualities. This is the order I shall pursue 

 in my inquiry; and a concise view of these particulars I 

 trust will be sufficient, to enable us to judge whether the 

 species of sugar I announce have all the characters of the 

 genus; and whether, white it possesses the quaUties of be- 

 ing wholesome and agreeable to the taste, it be sufficiently 

 abundant to supply our wants. 



On sugar and its species. 

 The immediate Nature, while she deposits in the various parts of the ve- 

 *^" getable structure those compounds, to which w^e give the 



* Abridged from the Journal de Phy-i|ue, vol. LXlll, p. 257. 



name 



