I «38 3 



"hy leaving an excefs of the earth, vras certain, that by the 

 fuperior affinity of lime for that acid, nothing elfe had been 

 taken up. Upon trying the folution with ammonia, no pre- 

 cipitate took place. By means of carbonate of potafti, I fepa- 

 rated the lime in the ftate of carbonate; and, after well wafh- 

 ing the precipitate, expofed it in a platina-crucible to a vio- 

 lent heat, till the weight no longer diminifhed. I am ac- 

 quainted with no more efficacious method to prepare lime, fit 

 for the delicate purpofes of fcientific chymiflry. 



'One hundred parts of this lime were difTolved in dilute 

 muriatic acid, in the fame platina-crucible, previoufly weighed ; 

 and then fulphuric acid was added in fufficient quantity. Sul- 

 phate of lime was precipitated; and the veflel was expofed to 

 a heat, at firit gentle, to evaporate the liquor ; and then, by 

 degrees, raifed to a temperature, which could expel every thing 

 tut the combined fulphuric acid, and leave the fulphate of lime 

 completely calcined. The crucible with the fait was then weighed 

 and the augmentation was 76. — It appears to me, that, if we 

 admit (and I fee no reafon that we fliould not admit it) that 

 calcined lime and calcined fulphate of lime are wholly exempt 

 from water, it muft bs clear, that the 76 additional weight 

 were fulphuric acid; and, that the fulphuric acid mult in this 

 JSate, more than ia any other, approach nearer to what may be 



termed. 



