[ 4*2 ] 



perature with the diflilled water, which 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 tafle, fparkling appear- 

 ance in the glafs, or by the chemical teft employed 

 in experiment 8. The fecond and third expert 

 ments fhew that it is very (lightly impregnated 

 with Selenites or other earthly falts ; and of this its 

 comparative levity affords alfo a further proof: for 

 it weighs twenty-iix grains in a pint lighter than 

 the Manchefter pump water*, and only four grains 

 heavier than diftilled water. The precipitation of a 

 grey powder, by the adding of a lblution of filver 

 in aqua fords to the water, renders it probable that 

 a fmall portion of fea fait is contained in it. For 

 the powder is found to confift 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 ; and thus a double elec- 

 tive attraction takes place in this experiment. 



This water is faid to contain iron, but the afler- 

 tion is at Ieaft rendered doubtful by the 6th experi- 

 ment, which was made with the utmofl accuracy ; 

 and I am inclined to think, that it is entirely with- 

 out foundation. The fpring is juftly celebrated for 

 its efficacy in haemoptoes ; and hence it may have 

 been too nattily concluded that it porTeffes fome 

 flight degree of ftypticity, by means of a chalybeate 

 impregnation. 



* Vid. the author's treatife on the pump water of Manches- 

 ter. Eflays medical and experimental, p, 207. 2d edit. 



The 



