352 Analysis of the Mineral Waters [Nov. 
from its own ingredients, to amount to 3:8 grains, this leaves 21° 
grains formed by the action of the sulphate of soda which had been 
added on the muriate of lime; and this is equivalent to 171 grains 
of muriate of lime. The saline matter obtained by evaporation of 
the solution weighed, after exposure toa red heat, 44:4 grains. Of 
this, supposing it to be all muriate of soda, 18 grains would be 
formed by the action of the sulphate of soda on the muriate of 
lime ; and there remain 26-4 grains as the quantity which the water 
had contained. ‘This quantity is rather larger, and that of muriate 
of lime rather smaller, than what are obtained by the other analyses. 
But the saline matter was found not to be entirely muriate of soda ; 
its solution became turbid on the addition both of muriate of 
barytes and of oxalate of ammonia, indicating the presence’ of sul- 
phuric acid and of lime, either in the state of sulphate of’ lime re- 
tained in solution, or of muriate of lime and sulphate of soda re- 
maining undecomposed. . An excess of sulphate of soda of 0°9 
grain, it has already been stated, had been employed, which re- 
duces the weight of the salt to 25:5 grains ; and if a little more be 
subtracted on account of the lime it contained, and be added to thé 
muriate of lime, it will give proportions nearly the same’ as thosé 
before assigned ; and the results by this method will thus reg Fiat 
with those by the others. 
Having stated this view of the composition of this water, I havé 
now to consider it under a more general light, and to point out 4 
few applications which follow from it, connected with the chemical 
constitution of waters which contain similar ingredients. 
—— a 
Sulphate of lime has been often stated as an ingredient existing 
in mineral waters with muriate of soda and muriate of lime.. It is 
almost superfluous to remark, that it is probable the original ingre- 
dients in all such cases are sulphate of soda and muriate of lime, 
and that the sulphate of lime is a product of the operation, or rather 
that the portion of it equivalent to the quantity of muriate of soda 
has this origin. 
It is a curious fact, which strongly confirms this, that in almost 
all the analyses of mineral waters since the time of Bergman, when 
they can be presumed to have been executed with any precision, 
where sulphate of lime is an ingredient, muriate of soda is also 
present, It is obvious that if the sulphate of lime has this origin, 
muriate of soda must also be formed. On the other hand, inthe 
greater number of those analyses in which muriate of soda is an’ 
ingredient, we find also sulphate of lime; and, with the exception 
of the water of Harrowgate, sulphate of lime is always inechier: 
where muriate of soda and muriate of lime are conjoined. 
But the principal interest belonging to this view is derived from, 
its relation to a question which has often been brought under dis- 
cussion—whether chemical analysis is capable of discovering the 
sources of the medicinal virtues of mineral waters? This question 
