N ON THE LIMB IN CttEAM OF TARTAR. 



X. 



Report on a \femoir of Mr. Destouches, Apothecary at Pa- 

 ris: by Messrs. Vauquelin and Boullay, Read at the. 

 Parisian Society of Pharmacy, Feb. 1(5, 1S07*. 



T: 



HE paper, on which these gentlemen were appointed 

 to make a report, was entitled, a Memoir on the Tartrite of 

 Lime contained in the Tartarous Acidule. 

 Tn preparing Preparing Rochelle salt in Quantity, Mr. Destonehes was 



unarmed na- desirous of collecting the tartrite of lime, that separates 

 tron ver^ little » ... 



tartrite of lime from cream of tartar at the moment of its saturation, in oi> 

 found. ^er to turn j t to accoUD t : but he was very much surprised 



not to obtain more than two pounds of precipitate at farthest 

 from about three hundred of cream of tartar, that he had 

 used, instead of ten times that quantity, which he had rea- 

 son to expect from the observations of Mr. Vauquelin, 

 Repeated with The same process repeated afforded Mr. Destouches but 

 the same eilect. a yer y s |jg| lt p rec ipitate, which, confirming the former, in- 

 duced him to make the following experiments. 

 Exp. 1. About 1st. To a boiling solution of eight ounces of crystallized 

 10 oz. of cream car ] J0nate f so da he added cream of tartar to the point of 



01 tartar gave * 



1 dr. of tartrite saturation, without any precipitate being produced : but af- 



e * ter the solution had stood twenty-four hours, a number of 



silky crystals were deposited, which when separated weighed 



five drachms. These crystals, being mixed with an excess 



of acidulous tartrite of potash, were reduced to one drachm 



by washing with boiling water. 



Exp. 2. Appa- 2d. A fresh experiment, made with the cream of tartar 



iTrs y U employed in the operations in the large way, afforded but two 



drachms of precipitate, which were reduced to eighteen 



grains by washing with boiling water. 



Tartarised na- Surprised by these results, Mr. Destouches conceived, 



tron remotes t hat the tartrite of lime might be dissolved by the Rochelle 



the solution of ... 



tartrite of lime salt, which prevented it from separating readily. In conse- 



ty toiling, but quence he boiled a pound of Rochelle salt and two ounces 



it falls down on _ . . 



standing. °* tartrite of lime in two quarts or water, when three drachm's 



• Annates de Chimie, vol. LX1I, p. 33. April, 18.7. 



of 



