'260. 



Brifk evapora- 

 tion. 



Cooling and 

 farther purifica- 

 tion by Cub- 

 fidence. 



Evaporation till 

 the fyrup draws 

 a thread. 



ACBARD ON SUGAR, 



CrvftallizaUon 

 or graining in a 

 warm apart- 

 ment. 



The melaffes 

 drawn oft* 



leave coajfc 



fugar. 



Jmprovsment. 



The fyrup, thus clarified and filtered, is placed In a (hallow 

 cauldron, to the depth of not more than fix inches, and- 

 evaporated over a brifk fire, whereby it is prevented from 

 becoming a liquid faccharine mucus, which refills all attempts 

 tocryftallize it. 



When reduced to about one half of its quantity, the fyrup 

 is to be poured into tin vetfels about fix feet in height, and 

 half a foot in diameter, with cocks about fix inches from the 

 bottom. It mutt here be left for two or three days, during 

 which lime it precipitates whatever remaining impurities" 

 it may contain, particularly gypfum. At the end of this 

 period, the liquid may be drawn clear off, and replaced in 

 the fliallow boiler, but only to the height of three inches, to 

 evaporate; the fire to be gradually augmented, as the fyrup 

 thickens, until it be in a ftate of ebullition. The fire* is then 

 to be damped to prevent the fugar from burning, which 

 would render it unfit for cryftallization. 



When the fyrup becomes fibrous, the fire is to be ex- 

 tinguiftied. 



In about half an hour afterwards, the fyrup is to be poured 

 into cones, of which the mouths are flopped with linen cloths, 

 and containing a little coarfe fugar-candy, grofcly pounded. 

 Thele cones are fet in a room whofe temperature is from 10** 

 to 20° of Reaumur. 



When the feveral operations have been dexteroufly ma- 

 naged, the fugar will cryftallize in 24 hours: but if the eva- 

 poration, or baking, has been too hafty, the whole becomes 

 a granulous mafs, with the interfaces filled with melaffes. 



When the fugar is well cryftallized, the mouth of the cone 

 is to be opened, and an earthern vetfel placed under to catch 

 the melalies : this operation, according as the fyrup has been 

 more or lefs baked takes three or four weeks. 



The fubftancc remaining in the cones, of a yellow colour, 

 more or lefs tinged with while as the baking has been well or 

 ill conducted, in granulated cryilals of various fizes, is the 

 coarfe fugar of beet-root. 



Mr. Achard, in order to fave time, and to avoid the ufe of 



vefiels'for fettling the liquor, afterwards deviated from his 



original plan, by adding to the fyrup, when half evaporated 



as above defcribed, for every twelve quintals of roots ufed, 



- five 



