MURIATES OF BARYTES AND SILVER, 



water, I can affirm, that the properties of the lime obtained 

 were altogether independent on the presence of these circum- 

 stances : yet I obtained from the same shells, by a some- 

 what more gentle heat, common caustic lime easily slacked. 



The dead lime obtained heated very strongly with muriatic Its properties- 

 acid diluted with a small quantity of water, without emit- 

 ting the smallest bubble of carbonic acid. Pieces of it re- 

 mained in water for twenty-four hours without falling to 

 powder; and notwithstanding this common lime-water was 

 formed, which is very remarkable. When the calcined 

 oyster-shells were thrown into a boiling lixivium of carbo- 

 nate of soda, the soda was completely decomposed, and a 

 Tery fine pap was formed. 



If this account be not sufficient to throw much light on 

 the subject in question, it will serve at least to guide the 

 reflections of men of science, and show how different opinions 

 on the existence of dead lime may be reconciled. 



IX. 



On the Muriates of Barytes and of Silver ; by Berthier, 

 Mine Engineer *. 



IN a paper on the sulphate of barytes &c. f I took it for Proportion of 

 granted, that muriate of silver contained 20 per cent f muriate of sii- 

 , , » i , •, , \. ver mistaken. 



muriatic acid, and hence I deduced the composition of the 



muriate of barytes, which I afterward employed in my in- 

 quiries concerning the sulphates. Recent experiments having 

 taught me, that this supposition was not strictly accurate, 

 I endeavoured to ascertain with more precision the propor- 

 tions of the muriates of barytes and silver. 



I put 10 gr. [154 grains] of barytes recently obtained Muriate of ba- 

 from the calcined nitrate into a glass stoppled phial filled rytestormed ' 

 with water. 0*4 of a gr. of carbonate of barytes remain- 

 ed undissolved. The solution was supersaturated with some 

 muriatic acid, and evaporated to dryness. The residuum, 

 calcined in a platina crucible, weighed 12-75 gr. It con- 

 tained 3*15 gr. of muriatic acid, since I had employed 



• Journal des Mines, vol. xxii, p. 323. 

 t Sc§ Journal, vol- xxiii, p. 280. 



9-eO 



