from indigenous Plants. ^ig, 



anrl I mud defer the experiments I mean to ihakc for this purpofe to another oppc>r- 

 tuiiiiy. 



Appendix to the Experiments for producing Sugar from indigenous materials. By Sic is. 



Fred. Hermbstadt*. 



In the continuation of my experiments on the runkelriibes, I endeavoured to afcer- 

 tait) the qnantity of real fiigar,. which is obtainable from a certain quantity of the. rape. 

 With this view I weighed accurately three pounds three ounces of the fyrup obtained by 

 my fecond experiment, which I poured into a conical vellel of tinned copper, and left 

 it ftanding in a temperature of from 65 to 70° Reaum. for flow evaporation. After the 

 expiration of eight hours. a cruft of grain or cryflals of fugar was formed on the fur-' 

 face, which after 24 hours was nearly one third of an inch thick. This was piiftied 

 dowiji, and fank in the liquid fyrup to the bottom. Two days afterwards a new crufl 

 was formed, and again pulhed dowiv. I repeated this operation till a pellicle appeared 

 on the furface of the remaining fyrup, which was not cryftalline, but merely tenacious. 

 This pellicle Indicated that all the cryftalhzable fugar was now feparated from the fluid ; 

 which was alfo confirmed by the tafte of the refidual fyrup, whicli was lefs fweet and 

 rrorc mucilaginoivs. At this period I transferred the whole of the cryftallized fugar, 

 together with the remaining fluid fyrup into fmall fugar-Ioaf moulds, which I kept foi 

 the fpace of eight days in a temperature of 30° Reaum. During this time all the liquid 

 fyrup was drawn off, and the fugjfr remained nearly in a dry (late. The whole operatioa 

 lafted 36 days, and the raw fugar, thus obtained, was fomewhat moift within, though it 

 did not liquefy in the open veffel in which it was left during three weeks. Its weight 

 was two pounds two ounces. The fyrup, which fpontaheoufly drained off, amounted 

 to 12 ounces. Hence of the 31b. and 3 ounces of fyrup made ufe of, only 5 ounces of 

 -watery fluid evaporated. According to this experiment, the fcheffd of thefe runkelr 

 liibes would afford about 5 jlb. of browrv raw fugar, and i^lb. of a fyrup, not quite 

 ill-tailed, and which if not ufed as fyrup, may with great profit ferve to make verjr 

 good brandy by diflillation. It does not fignify whether thofe runkelriibes be culti- 

 vated by a particular method orno ; for the fugar and fyrup were obtained from them in 

 the flate in which they grew, near Schoenberg on a moderately good ground. At pre- 

 fent I amoccupied w^ith the refining of my raw fugar, thus procured, in order to afcer- 

 tain what quantities of the finer fpecies of fugar, and how much fyrup I may recciv* 

 from it. 



Hermbstadt. 



* Likewifc from the Neu. Schr. d. Gefell. d. naturforfch. Freunde zu Betlin. page 450 — ji. 



3H fl On 



