P roctjs for exiraBing Sugar from iht But. ag 



This fyrup poured into fliallow earthen veflels, which prefent a large furface to the 

 air, is to be placed in a ftove at the heat of 20 or 30 degrees, or if agreeable at 30 or 40 

 of Reaumur, in order to cryftalize it. During this infenfible condenfation of the fyrup the 

 cryftalHne incruftation, which is formed at the furface, Ihould be occafionally broken, in 

 order that by favouring the evaporation the produft of cryftals may be haftened. As foon 

 as it is obferved that, inftead of the cryftalline incruftation, a thick gummy pellicle, not 

 granulated, is formed on the furface of the fyrup, it is a fign that the matter does no longer 

 cryftalize, but begins to dry, and the evaporation fliould then be ftopped. This refidue form^ 

 3 mixture more or lefs thick, of a cryftalline fubftance and a fluid vifcid matter. In order 

 to feparate the cryftalized fugar from the gummy extract, they are put together into a 

 fack of wet cloth tied tight, and then by means of a prefs, gradually applied, the fluid part 

 is to be paflTed through the cloth, and the fugar remains in the bag. This fugar after drying 

 is a yellow mufcovado, compofed of regular cryftals, which when pulverized form a white 

 powder of which the tafte is very good, being fweet and clear, and may be applied to a 

 number of ufes for which refined fugar is employed. By the operation of refining, fugar 

 may be made from this mufcovado of whatever quality is agreeable, and by repeating it 

 the fineft ('ugar may be had. The wafte in this manufa£l:ure, that is to fay the refidual 

 pulp, the fyrup or mucilage which paflTcs through the cloth when fubjefted to the prefs, the 

 fyrup In which the fugar has cryftalized, the wafhings, &c. &c. all thefe are ftill very ufe- 

 ful, and a confidcrable quantity of rum or brandy may be obtained from them, which may 

 be ufed in making up the fineft compounds. The mufcovado, fuch as is obtained by the 

 firft opperation,, cofts about a grofs and a half of Pruflia, without reckoning the watter 

 which may be had by turning the refidues to ufe. When we add this produft, and 

 when the manipulations fhall be more perfect, to efFefl: which I fliall employ myfelf this 

 winter, I am perfuaded that our European mufcovado will only coft half the price, or 

 9 fennlns ; and in the countries, where fuel is dearer, at i^rofs *. The manufadVure of 

 fpirits from the wafte of the fugar is of great importance, as by this means a great faving of 

 corn will be made, and the manufacturing of beet fugar, which delivers Europe from a 

 deftru£tive monopoly beconles ftill more interefting. I am at prefent employed in the at- 

 tempt to difcover a method of pouring the juice of the roots when fufficiently condenfed- 

 into moulds or forms, in order that it may acquire the figure of a fugar loaf, and afterwards 

 by claying become very white at a fingle operation. I have already found feveral methods 

 of obtaining this object very fpeedily. This new manipulation will facilitate the art of 

 fugar-making, and diminifti the price ftill further. 



• The pound in ufe at Berlin, being 476, iggrammes, and the value of the grofs, or of iz fenr.ins, being 

 J7 centimes, French money, it follows that the heftogramme does not amount to more than about 5 or 6 cen- 

 times, (or the pound, poids de marc, from z8 to 50 centimes). Note of the French editor.- -(about %\A. 

 per lb. avoirdup.) 



VII. 



