C *$« 1 



the fixed air, and by plunging a piece of red hot 

 glafs into it, raifed a copious and thick fume. This 

 floated upon the furface of the fixed air like other 

 fumes, and continued as long. 



Confidering the near affinity between water and 

 fixed air* I concluded that if a quantity of water was 

 placed near the yeafl of the fermenting liquor, it 

 could not fail to imbibe that air, and thereby acquire 

 the principal properties of Pyrmont, and other me- 

 dicinal mineral waters. Accordingly, I found, that 

 when the furface of the water was confiderable, it 

 always acquired the pleafant acidulous tafte that 

 Pyrmont water has. The readier!: way of impreg- 

 nating water with this virtue, in thefe circumftanceSj 

 is to take two vefTels, and to keep pouring the water 

 from one into the other, when they are both of them 

 held as near the yeafl as-poffible ; for by this means 

 a great quantity of furface is expofed to the air, 

 and the furface is alfo continually changing. In this 

 manner, I have fometimes, in the fpace of two or 

 three minutes, made a glafs of exceedingly pleafant 

 fparkling water, which could hardly be diftinguifhed 

 from very good Pyrmont. 



But the moft effectual way of impregnating water 

 with fixed air is to put the vefleis which contain the 

 water into glafs jars, filled with the pureft fixed air, 

 made by the folution of chaik in diluted oil of vitriol, 

 ilanding in quickfilver. In this manner I have, in 

 about two days, made a quantity of water to imbibe 

 more than an equal bulk of fixed air, fo that, ac- 

 cording to Dr. Brownrigg's experiments, it mud: have 

 been much ftronger than the beft imported Pyrmont ; 

 for though he made his experiments at the fpring 



head, 



