[ 2 5 ° 3 
greater diftance > I conjecture it may, as the heat 
will rarefy the ambient air, and we know the eleCtric 
asther is attracted at very great diftances in vacuo $ 
but this cannot properly be called an increafed acti- 
vity of eleCtric fire. 
We are afterwards told (page ib.) Cl that eleCtric 
“ fire will not mix with air whence, in the fuo 
ceeding feCtion, it is argued, “ That as each particle 
u of vapour, with its furrounding eleCtric fluid, will 
“ occupy a greater fpace than the fame weight of 
u air, they will afcend.” In anfwer to this, it muft 
be obferved, that there are fome bodies, whofe parts 
are fine enough to penetrate the pores of other bodies, 
without increafing their bulk ; or to pafs thro’ them, 
without apparently moving or difturbing them. A 
certain proportion of alcohol of wine mixed with 
water, and of copper and tin in fufion, are inftances 
of the firft of thefe j the exiflence and paflage of light 
thro’ air, and, I am perfuaded, of eleCtric fire, are 
inftances of the fecond. 
To illuftrate this, the following experiment wa9 
inftituted. A glafs tube, open at one end, and with 
a bulb at the other, had its bulb, and half way from 
thence to the aperture of the tube, coated on the 
infide with gilt paper. The tube was then inverted 
in a glafs of oil of turpentine, which was placed on. 
a cake of wax, and the tube kept in that perpen- 
dicular lituation by a filk line from the cieling of the 
room. The bulb was then warmed,, fo that, when 
it became cold, the turpentine rofe about half-way 
up the tube. A bent wire then being introduced, 
thro’ the oil into the air above, high electricity was 
given. The oil did not appear at all to fubfide : 
3 whence 
