on the Production of Dephlogificated Air . i \j 
where the fediment was formed, was but very imperfedUy 
illuminated. 
I intended to have repeated thefe experiments with variations, 
and to have made feveral others which I had projedted, and which 
I thought might have thrown fome further light upon this won- 
derful procefs of the produdtion of the pure air yielded by water ; 
but a feries of unfavourable weather putting a flop to my enqui- 
ries, and my time having been much taken up fince with other 
avocations, I have hitherto been prevented from putting my de- 
figns in execution ; and the feafon proper for thefe experiments 
is now fo far advanced, that I do not think it will be in my 
power to recommence them till the next year. In the mean 
time, to fulfil my promife to you, I fend you this account of 
the progrefs I have already made in thefe refearches ; and, 
when I fhall find leifure to purfue the matter further, I fhall 
not fail to acquaint you with the refult of my enquiries. 
I have the honour to be, &c. 
POSTSCRIPT. 
SINCE writing the above, an interval of fine weather, and' 
a moment of leifure, have given mean opportunity of making 
a few more experiments, of which I have thought it right to 
give you a fhort account. 
And I muff begin by acquainting you, that having never 
been thoroughly latisfied with refpedt to the origin of the de- 
phlogifticated air produced upon expofing frefh vegetables in 
water to the adlion of the fun’s rays, according to the method 
of Dr. Ingen-t-iousz, my doubts, with refpedt to the opinion 
generally entertained of its being elaborated in thevelfels of the 
plant,. 
