C 6o 1 
objedlion to the apparatus, which, with moll people, 
might have conliderable weight. The bladder, which 
formed part of it, was thought to render the water offen- 
iive ; and when the folvent power of fixed air is confi- 
dered,k will not appear improbable, that the water would 
be always more or lefs tainted by the bladder. In fome 
trials which I made with Dr. Priestley’s apparatus, it 
always happened, that the water acquired an urinous 
flavour; and this tafte in the water was, in general, 
predominant that it could not be fwallowed, without fome 
degree of reluctance.. The difficulty, therefore, in the 
condu6l of the procefs, and the offenfivenefs of part of 
the apparatus, made fome lefs exceptionable method of 
producing the impregnation defirable. This I varioufly 
attempted, keeping convenience and cleanlinefs con- 
ftantly hi view; and I flatter myfelf, that I have at lafl’ 
contrived an apparatus that will perfectly anfwer the in- 
tended purpofe. It is now tw^elve months fince this con- 
trivance has been in conftant ufe ; and hitherto there is 
no reafon to wifli for the leafl alteration. Prefuming, 
therefore, on the poffibility of its becoming, when known, 
extenfively ufeful, and convhiced of the favourable re- 
ception which every attempt of this nature meets with 
from the Royal Society, I beg leave to communicate to 
them a defcription of the apparatus that I have invented^ 
and of the manner of conducting the procefs.. 
DESCRIPTION 
