316 Mr. Horner on the Mlntrahgy of the Malvern Hilts. 



h. A few drops of dilute muriatic acid, which dissolved the whole 

 ■with a brisk effervescence. 



I. Oxalate of ammonia, a copious precipitate. 



k. The solution from which the lime was thrown down, by the 

 last experiment, was filtered, and the same test applied as in exp, e, 

 which produced a similar effect, but in a very slight degree. 



The water of Walm's Well therefore contains about 12 grains of 

 solid ingredients in a gallon, which appear to consist of : 



1. Carbonate of lime as the principal ingredient ; by exp. h. t. 



2. Carbonate of magnesia in minute quantity, by exp. a. k. and 

 by the effect of the barytic water in the preliminary experiments. 

 From the change produced on the violet paper, in exp. «, and from 

 the action of the barytic water, which last test occasions a precipitate 

 with carbonate of soda, I suspected that there might be a small 

 quantity of that alkali existing in the water of the spring ; but by 

 comparative trials I found that, on applying these tests to a solution 

 of carbonate of magnesia in water, exactly the same effects were 

 produced. 



3. Muriate of soda ^ or magnesia^ by exp. ^, e ; probably the latter ; 

 for in one experiment, the entire solid ingredients were, by accident, 

 dried at a heat that must have decomposed the muriate of magnesia, 

 that earth being found in the insoluble residuum in greater quantity 

 than when the evaporation had been carried on with a gentle heat, 

 and there was only a trace of it discovered in the part soluble- in 

 water. 



4. Sulphate of soda, or magnesia, by exp. r, e, f; probably the 

 former; as the proportion of sulphuric acid indicated is more conside- 

 rable than that of magnesia, and that earth seems to be combined with 

 muriatic acid. 



