3B8 Dr. ingenhousz’s Account of a 
and one inch in diameter : the eether being foon evapo- 
rated, I clapped my hand upon the mouth of the glafs, 
and inverted it to incorporate the air generated by the 
tether with the common air; after which I left the glafs 
open during half an hour, when I dipped in it a piece of 
wax taper burning, ftuck upon a bended wire. As foon 
as the taper reached the brim of the glafs, a flame burft 
out with a weak explofion. In a quarter of an hour I 
again thrufl the wax taper into the fame cylinder, and 
no flame was obferved till the wax taper reached the 
place where the flame ended the firft time. This fe- 
eond explofion did not fet fire to the whole at the bottom 
of the glafs. I again waited a quarter of an hour, and 
then again thruft the wax taper into it, by which the re- 
mainder of this inflammable gafs, which had remained 
fettled all that time at the bottom, was exploded (b> . 
(b) It is remarkable, that aether, the mofl: volatile liquor yet known, and fo 
apt to fpread itfelr through the air by a quick evaporation that a drop of very 
fine aether, which falls from the height of a few feet, is quite evaporated before 
it reaches the ground, and no glafs ftopper of itfelf is able to keep it from eva- 
porating: it is remarkable, I fay, that notwithftanding this extreme volatility, 
the air or vapour, into which it changes by evaporation, fhould be fo far from 
participating of the fame volatility, that it may be kept hours together in an 
open cylindrical veflel without evaporating, mixing with the common air, or 
Jofing its inflammability; fo that this fubftance feems to undergo a fudden meta- 
morphofis, and to change in an inftant from the lighteft of all liquors to one of 
the heavieft of aerial fluids, fixed air, which being one half heavier than 
common air, according to the experiments of Mr, cavendish, is probably 
much heavier than this aether air. 
I found 
