4^ Method of Jeparathfg the whole of 



invention with pit-coal did in the laft rcntiuy. Thus, it is 

 very poUiblc that the bare attempt will meet with as keen 

 reprobation, dictated by the fame narrow, felfifli, and unen- 

 lightened fpirit which marked that period, and which has hi- 

 therto clouded the o-cniud of our manufa&urins; clals. 



IV. Advantageous Method of feparailng the tuhole of the 

 tartarous Acid from crude Tartar. Bv JM, LowiTz; 

 abridged by Dr. Van Mons, of Bruffils*. 



M, 



R. LOWITZ fiiowed, in the year 1786, that a tartarous 

 acid might be obtained by charcoal du("t from crude tartar, 

 as pure as that obtained from white tartar ; but as the tartrite 

 of potafh, which is feparated in this operation, is too ftrongly 

 united to the colouring matter of the tartar to be able to get 

 rid of it, the lofs of this fait, necefl'arily occafioned by the 

 procef?, deftroved all the advantage derived from it. Means, 

 indeed, had been found to decompofe entirely the acidulous 

 tartrite of potafli by the means of quicklime; but this procefs 

 is accompanied with great inconveniencies, which M. Goet- 

 tling attempted to obviate by propofing to decompofe the 

 tartrite by the acetite of the fame earth. 



This procefs, however, of Gocttling cannot be employed 

 but with white tartar, on account of the impoflibility of de- 

 priving of its colour the acetite of potafli which refults from 

 it. This induced M. Lovvitz to endeavour to difcover an- 

 other method of decompofition. 



This method confifls in mixing together 15 lb. of crude 

 tartar with 41b. of chalk, and adding gradually 300 lb. of 

 cold water. After the etfervefcence has ceafed, the mixture 

 muft be heated ; and at the moment when it boils, you throw 

 into it fomctimes a little tartar, and fometimes a little chalk, 

 imtil no more eflcrvefccnce is excited : you then filter the 

 liquid, and precipitate it by means of a folution of the muriat 

 of lime. You then decant the coloured liquid, and wafli the 

 united precipitates until they have been deprived of all the 



* From the Annalcs dc Chimie, No. 101. 



feparable 



