[ 393 1 
prefently feparated to the diftance of two inches. 
The match, when placed in the fame fituation, 
and not fmoking, had no fuch effedfc. 
EXPERIMENT IV. 
Having placed an earthen half-pint mug, upon 
a (land properly infulated ; I fixed to a large ball 
of brafs, which I had placed in the bottom of it ; 
the end of a wire, fix, or eight feet in length. 
The other end of the wire I connected with the 
prime conductor of a fmall eledtrical machine 
{Tab.-xiii. fig. 3 .]. Over this mug, and as near to 
ceiling of the room as I could, I fufpended a pair 
of light cork balls. Then filling up the veftel with 
boiling water, I began to work the machine; and 
in fifty, or fixty turns of the winch, obferved the 
balls to feparate three eighths, or half an inch, 
from each other. I then took off the electricity 
of the bodies ; emptied the veflel, and cleared it 
of the vapour ; and having placed the apparatus in 
the fame manner, I again worked the machine, 
for a longer time; but without effedt. On repla- 
cing the boiling water, I fucceeded as at firft. At 
other times, when 1 have been able to feparate the 
balls by the air alone, to a fmall diftance ; yet by 
pouring in the hot water, the vapour has prefently 
increafed their divergence from one eighth, or 
three fixteenths, to half an inch diftance ; or in 
that proportion, according to the ftate of the at- 
mofphere with refpedt to drynefs or moifture. In 
fhort I have repeated thefe kinds of experiments fo 
often ; and many times with fo much fuccefs that 
I can have no doubt of vapour being a condudtor 6f 
eledlricity. 
Vol. LXIV. Eee expe- 
