ON THE LIME IN CREAM OF TARTAR. g(J 



of the calcareous salt were dissolved; but, after standing 

 two days, the whole was deposited in a needly form, so as 

 not to «how an atom of lime on the addition of oxalate of 

 ammonia. 



Whence -could arise thjs difference in the quantity of tar- 

 trite of lime in different parcels of cream of tartar, which, 

 according to Mr. Destouches, was ¥ V m tne fi fst experiment, 

 and T ^ in the second ? 



To account for this fact, and ascertain whether, if the Supertartrite 

 ... . n , • i t,,i , , >, P of potash takes 



acidulous tartnte of potash contained little or no tartnte ot • gf tor- 



lime, it might acquire some in the process of purification, trite of lime by^ 



the author boiled two ounces of tartrite of lime and eight of ^ oili "g theiu 



, together. 

 cream of tartar in eight quarts of water. In this process the 



latter retained T \ of its weight of the former. 



Mr. Destouches farther satisfied himself of the propor- 

 tion in which the tartrite of lime unites with boiling water. 



Lastly, he concluded from his experiments: General con-: 



1st, That the quantity of tartnte of lime in cream of tar- clusions - 

 tar is liable to vary from the smallest quantity to seven per J^y^^ 19 

 cent. 



c 2dly, That tartnte of lime is soluble in six hundred parts Soluble in 600 

 of boiling water; and that it is susceptible of a regular cry- P artsof boiling 

 stallization by being dissolved in a soluble tartnte. 



3dly, That, in making Rochelle salt, the solution should In making tar- 

 be suffered to cool, in order to deprive it of tartrite of t Jg b g j" t j* r ° n 

 lime. should be suf- 



4thly, That the carbonate of soda affords the most simple fered tocooL 



means of analysing cream of tartar with respect to tartrite SO(Ja test °f 



of lime*. lime in cream 



of tartar. 



Experiments and reflections hy the commissioners. Experiments 



1. Six parcels of cream of tartar of the shops, bought at by d ^jf uq ,V clm 



differeut places, were numbered. A hundred drachms of c . , - 



r ' . Six parcels of 



each, saturated hot with a solution of pure carbonate of cream of tartar 



soda, exhibited towards the end of the saturation a greater 1eft dl ^ erent 



, . & proportions of 



or less quantity of precipitate, which separated spontaneous- tartnte ethnic. 

 ly, but only toward the end of the combination. The so- 

 lutions, filtered separately, as soon as they were cooled, left 

 on the filter a substance, part of which was crystalline, part 

 pulverulent, in the following proportions. 



Cream 

 • See page 32. 



