[ *51 ] 
I have mentioned hot liquors only, becaufe the 
fleam is more vilible in them : not but the fame cafe 
often happens in evaporation, where we cannot fo 
eaf^ly perceive it. 
LETTER IIL 
Yo the Reverend Thomas Birch^ D, D, 
Secret. R. S. 
S I Lifmore (in Ireland), March 31, I755r 
Read April 2 j, "I" Received your obliging letter of the 
A inftant, of which I am highly 
fenfible, and fhall always be fubfervient to your 
commands. 
You do me the honour to tell me, that the Royal 
Society defire to know the experiments, by which I 
found all afcending vapours and exhalations to be 
eleftrified. At firft I only fuppofed they mufl be 
fo, according to the reafonings in my letter; but 
upon trial, with a very limple apparatus, I had the 
pleafure to convince myfelf that they were fo. 
I extended a fine firing of filk eight feet horizon- 
tally, and from the middle fufpended two pieces of 
fuch down as grows upon our turf-bogs, by two 
pieces of fine filk, about twelve inches each in 
length ; and then, by rubbing a piece of fealing-wax 
on my wafte-coat, over my fide, I eled:rified the 
pieces of down ; and then brought fundry burning 
things under them, fo as to let the fmoke pafs in 
great plenty through and about them, to try whether 
Sic eledric fluid would run off with the fmoke ; but 
I had 
