on DIFFERENT SPECIES OF SUGAE. $]$ 



fey any one before Deyeux : He perceived, that it was a 



species of the genus, habitually fluid, and to be classed. 



among the immediate products. Fie judged too with ^ea- rpj^^ ^j^, ^^^ 



fion, that of the two species of sugar known it was the only that will fer- 



one capable of fermenting by itself, while the other will "'^"^,^P«"ta- 



^ _ o ^ ' ^ neously. 



not undergo this change unless disposed to it by some fer- 

 ment. 



The labours of Duthvone too has so clearly confirmed To separate 



this from the 

 solid the only 



the existence of this product by the various facts he has 

 collected in his work, as to render it no longer disputable, object of the 

 that the only object of the sugar-makers must be, to sepa- "^^" ™^ ^* 

 rate the crystallizable sugar from the fluid : but I shall give 

 liere the results of the analysis I have begun of the sugar- 

 canes of Malaga. 



In the juice of these, when fresh drawn, we find green Juice of Spa- 



fecula, gum, extract, malic acid, sulphate of lime, and "'""^ ^"Sav 

 ■ c 1 canes exa- 



the two species or sugar. All these products, except as to mined. 



their varieties, are the same as those met with in most 



fruits. 



A slice of the cane put into infusion of litmus reddens it Contains an 

 powerfully : yet its juice is not perceptiblj^ acid to the taste, ' 

 because the acid in it is only in a very small quantity, and 

 the sugar covers it ; but in the juice boiled down it is plainly 

 perceivable. The following are the effects of reagents 

 on it. 



The oxalic acid and barytes form a copious precipitate with sulphate of 

 it, which proves, that it contains sulphate of lime. Con- ' 

 centrated solution of platina throws down nothing so that no potash, 

 it contains no salt with base of potash. 



Alcohol poured on the sirup of the cane separates from it gum, 

 insoluble filaments, which fall to the bottom of the vessel, 

 and are pure gum. Some time after the gum a small por- 

 tion of a white powder falls down, which is sulphate of lime. 

 This single product classes the juice of the cane with that 

 of most fruits. 



The sirup, when freed from the gum and sulphate, forms extractive mat* 

 copious precipitates with the nitrates of lead and silver. With *"^* 

 limewater too a precipitate is formed, and the liquor turned 

 green. This indicates the presence of extract, which mu- 

 riate of tin confirms by precipitating a whitish lake. The 



same 



