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IV. ^beDefcription of an Apparatus for impregnating Wa- 
ter with fixed Air \ and of the Manner of condudiing that 
Procefs, By John Mervin Nooth, M. D. F. R, 
Reekie, Dec. | '^HE poliibility of impregnating water 
^ ^ A with fixed air was no fooner afeertained, 
by experiment, than various methods were contrived to 
effe(5l the impregnation. The ingenious Dr. priestley, 
however, is the 6ply one that has publiflied any deferip- 
tion of an apparatus, calculated intirely for this purpofe. 
This apparatus was communicated to the public, with the 
view of promoting the difeovery of the medical effe61s of 
fixed air united with water; and, in confequence of this 
communication, fome very fuccefsful attempts have been 
made in the cure of difeafes. The experiments, however, 
have not been fo numerous as one could have wifhed ; 
perhaps the difficulty in condudling the procefs, in the 
manner propofed, has been, in fome meafure, the reafon 
why fo few experiments, on this fubje61, have been made 
public. For although, in the hands of the do6tor, the ap- 
paratus was fufficiently convenient, it mufi; be confeflhd, 
that the conducT of the procefs required more addrefs 
than generally falls to the lliare of thofe that are unac- 
cuftomed to fuch experiments. Independent too of the 
inconveniences attending the procefs, there was another 
1 2 objedliori 
