35S Analysis of the Hot Springs at Bath. 



Dr. Gibbes. To find the quantity of each of these, the fol- 

 lowing methods were employed : 



{y) A qu;irt of the water was evaporated to dryness in a 

 ■ platina crucible : the residuum, dried in a sand heat, weighed 

 thirty grains. Tliis was boiled, with successive portions of 

 distilled water, till it ceased to afl'ord a prccipilafe with ni- 

 trate of barytes. The solution was then divided into three 

 equal quantities. 



{z) To one of these portions nitrate of silver was added 

 as long as precipitation took place, and distilled water was 

 poured on the precipitate till it came away quite pure. The 

 muriate of silver thus obtained was weighed after exsiccation, 



(A) The second quantity was treated with oxalate of am- 

 monia while it continued to produce any effect. The preci- 

 pitated oxalate of lime was washed, dried, and weighed. 



{B) To the remaining part of the solution nitrate of ba- 

 rytes was added till it ceased to produce any precipitate ; 

 and the sulphate of barytes obtained by its action was 

 weighed, after washing and drying, as in the former expe- 

 riments. 



(C) The residuum, insoluble in water, weighed, wheri 

 dried, two grains : nitric acid added to it dissolved 1"7 grains. 

 This solution afiorded no precipitate with ammonia, but a 

 copious one with oxalate of ammonia : it was therefore ni- 

 trate of lime obtained bv the decomposition of ihe carbonate. 



(D) The '3 of a grain left bv the nitric acid was dis- 

 solved by potash, and precipitated from it by muriate of am- 

 monia. This precipitate was not again soluble m nitric acid, 

 and was consequently silica. 



Another quart of the water was treated in the same way. 

 To av(,'id prolixitv, I shall state the quantity of each precipi- 

 tate afforded by one-third of a quart multiplied by three, 

 and make the requisite calculations from the mean of the 

 two experiments. 



i:xp. I. Exp. IT. Mean. 

 Residuum - 30* grains 30" 30* 



TNIuriate of ;iiver 16-2 do. l6-2 16-2 



Oxalate of liine lS-3 do. 17'7 18' 



Sulphate 



