[ 4 62 ] 
perature with the didilled water, wliich weighed 
three ounces, four drachms, and forty fix grains. 
Matlock water is grateful to the palate, and of an 
agreeable temperature, but exhibits no marks of any 
mineral fpirit, either by its tade, fparkling appear- 
ance in the glafs, or by the chemical teft employed 
in experiment 8. The lecond and third experi- 
ments lhew that it is very flightly impregnated 
with Selenites or other earthly falts ; and of this its 
comparative levity affords alfo a further proof : for 
it' weighs twenty-lix grains in a pint lighter than 
the Manchefter pump water*, and only four grains 
heavier than diddled water. The precipitation of a 
grey powder, by the adding of a folution of filver 
in aqua fortis to the water, renders it probable that 
a fmall portion of fea fait is contained in it. For 
the powder is found to confid of the particles of 
filver, combined with the muriatic acid, which is 
feparated from the foffil alkali by the fuperior affinity 
the nitrous acid bears to it j and thus a double elec- 
tive attra&ion takes place in this experiment. 
This water is faid to contain iron, but the affer- 
tion is at lead rendered doubtful by the 6th experi- 
ment, which was made with the utmod accuracy ; 
and I am inclined to think, that it is entirely with- 
out foundation. The fpring is judly celebrated for 
its efficacy in haemoptoes ; and hence it may have 
been too hadily concluded that it poffedes fome 
flight degree of dypticity, by means of a chalybeate 
impregnation. 
* Vid. the author’s treatife on the pump water of Manchef- 
ter. Eflays medical and experimental, p.207. 2d edit. 
The 
