t^ N'civ Method of extracting 



thev bear extremely well to be washed with boiling water, 

 arid are capable of resisting a heat of a still more elevated 

 temperature without losing the varnish ; but at all events 

 care should be taken not to rub tlve vessels with sand, or 

 any other hard bodies. 



IV. New Method of extracting raw Sugar from the 

 Beet-root. Btj M. Achard*. 



J- HE beet-roots, properlv cleansed, must be subjected to 

 the press, bv which a thick juice of a dark colour will be 

 obtained ; which, besides sugar, contains also albumen, ex- 

 tractive matter, and other substances, which must be sepa- 

 rated before sugar can be obtained. In this separation con- 

 sists the principal part of the process. 



In a tin or tinned copper boiler mix 100 pounds of the 

 juice of the beet-root with three ounces six drams of sul- 

 phuric acid diluted in one pound of water, and immediately 

 pour the matter into vessels, in which it must be left stand- 

 ing twelve, eighteen, or twenty-four hours. Twelve hours 

 are sufficient, but it cannot sustain any injury in twenty- 

 four, as the acid prevents any alteration of the juice. To 

 separate the sulphuric acid, incorporate with the juice seven 

 ounces and a half of wood ashes, and afterwards two ounces 

 six drams and a half of lime slaked with water. The sul- 

 phuric acid coagulates the albumen, and the ashes, with 

 the lime afteruards added, separate the acid in the form of 

 a salt not very soluble. Indeed, it is a well known fact, 

 that in the manufactories of raw sugar in the West Indies, 

 as well as in our sugar-houses in Europe, lime is employed 

 to promote the separation and crystallization of sugar. 



Whis this operation has been performed, it is necessary 

 to clarify the juice of the beet-root ; for which purpose it is 

 removed into a boiler, set in such a manner that the tire 

 can act only on its bottom. The fire is increased to a de- 

 gree approaching to ebullition without stirring the liquid. 

 The fire is then extinguished, and the scum is taken oif as 

 fast as it rises, in the form of large black flakes. The li- 

 quor is afterwards passed through a wooden strainer, taking 

 the precaution not to shake it too much, lest the sediment 

 should be mixed with it, and stop the pores of the strainer. 

 The scum and the dirt left upon the filter serve as food for 



The juice, thus clarified aod filtered, is poured into a 

 boiler, with a flat bottom, to the height of only six inches, 



• From Keucs Journal dcr Chemie, 



and 



