4»4 On the PrcduBion of Sugar 



pared lime-water and gently boiled down. The fharp radifh-like flavor was driven off 

 during the boiling, and Lobtained at laft ten pounds of a tranfparent brown-yellow (yrnp, 

 in every refpeft nearly refembling the fyrup obtained from the black birch (d,) and 

 iexhibiting the fame foreign tafte. It might be profitably ufed inftead of the common 

 ■ brown fyrup. For the purpofe of producing fugar from this fyrup, I expofed a portion 

 of it to flow evaporation in a glafs veffel, in which fome fticks were placed ; and after 

 fome weeks fmall faccharine cryftals were forrhed, the quantity of which I was unable 

 to afcertain. Yet, this rape being dearer than the white mangold and runkelriibe, and 

 yielding a much lefs agreeable fyrup, than even the turnep itfclf, it mull; in this 

 xehcB., always give way to thofe three fpecies. 



0. Experiments with the Skirret. (Sium Sifariim, Lin). 



Marggraf (loco citato) obtained from one pound of frefh fkirrets 4?- ounces of dried 

 extraft, and from ilb. of dried roots he obtained three drams of genuine fugar. My 

 experiments were this time only direfted towards producing a fyrup that might be fit for 

 ufe ; becaufe the extraftion of dry fugar, as was obferved by Marggraf \-\imie\i, is fub- 

 jcft to many difficulties, on account of the many farinaceous parts thefe roots contain. 

 As thefe roots, from their fi(|«llnefs, are not eafy to be grated, I had owafhcjfd of theih, 

 weighing 26 pounds, bruifed, with the addition of cold water in a Hone mortar, and the 

 pulp afterwards prefled. The refidue was again moiflened with cold water, and prcfTcd 

 a fecond time, by which management I obtained a turbid fweet juice. I left this Hand- 

 ing for eight days in a cold place, during which a great portion of mealy fubftance fell 

 down, and the liquor became clear. It was then clarified with a fmall portion of white 

 of eggs, and afterwards infpiffated ; and thus it aflforded five pounds of a pleafant, 

 light-brown fyrup. It is evident, therefore, that thefe roots are-much too dear to be 

 employed in making a cheap fyrup. 



p. Experiments with Parfneps. 

 (Paftinaca fativa, Lin.) 



The particular fweetnefs of this root, which in other refptfls is verj' ligneous, iji- 

 iuced me to fubjeft it to fimilar experiments, though Mdrggraf had already obferved, 

 that only an inconfiderable quantity, of fugar can be procured from it. 



With this intention I treated one. fcheffel of the roots, weighing 24 pounds, exaftly in 

 the fame manner as the fkirrets. The fyrup amounted to 5! pound weight, of an 

 agreeable flavour, but did not thoroughly lofe the particular tafte of the parfnep. 



If my other occupations had permitted, I fhould not have neglefted to afcertain th» 

 relative proportions of real fugar contained in a certain determinate quantity of the fub- 

 Hancfts fubjefted to cxaniijwtion. Such an attempt was at that time out of jny power, 



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