<J$ os THE LIME IN CREAM OF TARTAR. 



thirty-five hundredth parts of the whole. Consequently the 

 specimens of cream of tartar, which were the object of our 

 inquiries, contained the following quantities of lime; 



grs. grs. grs. 



Proportions of No. 1 — 17*82, No. 3 -*• 17*28, NO. 5 — 2052, 

 !&£&« S- 81-68, 4-21-08, 6 - l 7 -38: 



and therefore of tartrite of lime ; 



gr*. grs. grs. 



and hence of No. t — 50*91, No. 3 — 49*37, No. — 58'63, 

 *a«-trite. g — 61-94, 4 — GO* 17, .6 — 49*37- 



General infer- From all these facts we conclude: 



fcnces. 1st. That it is true, that the quantity of tartrite of lime 



Proportion of varies in different parcels of cream of tartar to be met with 

 tartrite of lime , , , . j . . . . , , _ 



from 05 to 07. in the shops : but that this variation does not exceed troni 



five to seven per cent, at least in those we had an opportunity 



of examining. 

 "fexists in the 2 dly, That it is more natural to look for the source of this 

 trude tartar, earthy salt in the crude tartar, which contains it ready 



formed, than to suppose it produced in the process of puri* 



tying it. 

 Carbonate of 3dly, That the carbonate of soda does not appear by any 

 test an ° ta8 °° means calculated for the analysis of cream of tartar with re-. 



spect to tartrite of lime. 



Tartarised na- 4thly, That in fact Rochelle salt promotes the solution of 



iron retains a this calcareous salt with the assistance of heat; and it has 

 portion. _ _ . , . . . 



the farther inconvenience of retaining a certain quantity a 



long time in solution. 

 Khouldbe fiord Sthly, That the Rochelle salt of the shops always con- 

 from it by cold tains more or less of this earthy salt, and that it ought to be 

 redissolved in cold water, to obtain it perfectly pure. 



6th, That the mode of analysis we employed appeared 

 to us very proper, to make known precisely how much tar- 

 trite of lime is contained in the acidulous tartrite of pot- 

 ash. 



XL 



