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riment. This precipitate will be infoluble in water as in the 

 3d ; the addition of more lime-water will not increafe it, as is 

 feen in the 4th, all the fixed air being already taken up; but 

 on adding to this mixed liquor more of the acid folutions a 

 precipitate will appear as thefe acid folutions convey an addi- 

 tional quantity of fixed air, which ads on the lime-water con- 

 tained in the mixed liquor, as in the 5th experiment; the 

 precipitate will be lefs copious in the boiled folutions, as much 

 of the fixed air is expelled by the boiling, as in the 6th expe- 

 riment ; and finally, no precipitate will be formed in the acid 

 folutions of lime, as in that cafe no fixed air can exift. 



This fburce of ambiguity being removed, I now proceed to 

 the experiments made to difcover the relation of Stronthianite to 

 acids. 



To the Marine. 



Stronthianite diffolves very readily in the marine acid, 

 whether concentrated or diluted, and with confiderable efFervef- 

 cence ; 100 grains of Stronthianite lofe by folution in acids 26 5.. 

 Common lime-ftones, equally free from foreign mixture, con- 

 tain much more fixed air ; barytic lime-ftones much lefs, and are 

 more difficultly foluble. 



The acids of vitriol, tartar and fugar, being fucceflively dropped 

 into this muriatic folution, inftantly produced copious precipitates 

 ftill more infoluble than thofe that arife from their union witli 

 common calcareous earth. 



This 



