Jrcm "European Vegetable ProJuSJkr.s. lit 



fyrup, in which, after the end of three months, a kind of 

 brown granulated fugar had cryftallifed. This fugar, how- 

 ever, was not free from a foreign tafte. That fugar can be 

 obtained from this plant is therefore proved, but, in an eco- 

 nomical point of view, neither the fugar nor the fyrup it pro- 

 duces would be advantageous, as both would be too ex- 

 penfive. It is not improbable that this plant in our climate 

 is lefs abundant in fugar than that found in Kamtfchatka. 



6. Experiment with the Juice of Grapes in order to obtain 

 Sugar. 



The liquor obtained from perfeftly ripe grapes, evidently 

 fhows, by its fvveet tarte, that it contains abundance of 

 faccharine matter, but mixed with a grea*^ deal of muci- 

 lage. In order that I might try how fai it was pofJible to 

 procure from it real fugar, or at Icaft fyrup, fit for domeftic 

 purpofes, I undertook the following experiment : — Eight 

 Berlin quarts of juice obtained from perfeftly ripe and fueet 

 grapes, by merely fuffering it to diftil fpontaneoufly, was 

 mixed with the white of an egg, then boiled and clarified, 

 and afterwards filtered. The clear filtered liquor being eva- 

 porated, gave three pounds of a fyrup not unpleafant, but 

 which had a fomewhat fourifli tafte. To free it from its 

 acidity it was diflTolved in lime-water, till it appeared by re- 

 agents that it contained no more free acid. The liquor was 

 then once more clarified with the white of an egg, and agi'.iu 

 evaporated, by which means I obtained a very pieafant fyrup, 

 but notwithltanding all piy labour I was not able to procure 

 from it cryilallifed fugar. This fyrup, therefore, while a 

 hogfhead of new wine cofts fiftefin dollars, would be loo 

 expenfive to be ufed for domeftic purpofes. 



"J . Experiments luith the Juice of the JVhite and Black Birch 

 to obtain Sugar Jroni it. 



Different opinions have been entertained refpeAing the 

 pofBbility of obtaining fugar from the juice of the birch. 

 /\6 fome have alTerted t)iat fugar may be procured from this 

 liquor, while others have maintained the contrary, I was 

 dtffirous to dt'ternuiie the queftion by my own experience. 



Accordinjj 



