qc>4 i>\ Priestley’s Experiments and Ohfervations 
from each other. Indeed the pieces of malleable iron adhered 
together after the experiment, but by no means fo firmly. 
Cad iron annealed (by being kept reddiot in charcoal) is 
remarkably different from the call: iron which has not under- 
gone that operation, efpecially in its being, to an extraordinary 
degree, more foluble in acids. With the turnings of annealed 
call iron I made the following experiment. From 960 grains of 
this iron, and with the lofs of 480 grains of water, I got 870 
ounce meafures of inflammable air, and tranfmitting fleam 
through them a fecond time, I got 1 50 ounce meafures more. 
The iron had then gained 246 grains in weight, and the pieces 
adhered firmly together ; but being thin they were eafily broken 
and got out of the tube, whereas it had required a long time, 
and a fliarp fleel inflrument, to clear the tube of the cafl-iron 
nails. 
Haying got water from the fcales of iron and of copper fatu- 
rated with dephlogiflicated air, by heating them in inflammable 
air, it occurred to me to make the fame experiment with preci- 
pitate per fe, and I found, that the moment that the focus of 
the lens fell upon this lubflance the mercury began to revive, 
the inflammable air rapidly difappeared, and was formed 
on the fides of the veflTel in which the experiment was made. For 
want of a better fun, I could not afcertain every circumflance 
relating to this procefs ; but what I did feemed to afford a 
fufficient proof that mercury contains phlogiflon, and that it is 
not revived by the mere expulfi on of dephlogiflicated air, as 
M. Lavoisier fuppofes ; efpecially as no fixed air was found in 
what remained of the inflammable air. In one of thefe expe- 
riments 4.5 ounce meafures of inflammable air had difappeared, 
and 1.6 ounce meafure remained ; and this appeared to contain 
fbme dephlogiflicated arr mixed with the inflammable. 
. Willing 
