C T 4-o 1 
often be productive of the other, as is plain from Dr. 
Franklin’s experiments. 
If cold eledrifies the air pojitivcly in this climate 
(which feems extremely probable), may it not elec- 
trify it negatively at and about the place of our anti- 
podes? Does not a confideration of the effeCts dis- 
covered in the Tourmalin favour this furmife? 
The electricity of the air, in frofty, foggy or 
mifly weather, is not itrong enough to yield any 
fpark, even by infulating a fiiarp pointed wire in it, 
which, however, attracts very light bodies at a fmali 
diftance ; whilft, on the contrary, that of the clouds 
generally affords confiderably ftrong fparks. 
When a fog becomes very thick, the cork-balls 
approach ; but when it returns to its former ftate, 
they open again at their fir ft diftance ; and I have 
obferved that, when it rained in foggy weather, the 
balls clofed, and opened again on the fog’s appear- 
ance anew, after the rain had ceafed : there is, how- 
ever, a certain degree of denfity neceftary in a fog, 
in order that the balls might exert their greateft di- 
vergency. 
Moft, if not all, fogs partake of a fmell much 
like that of an excited glafs tube, and, indeed, fo 
does the common air very frequently. 
As fogs fometimes appear in a very moift ftate of 
the air, I was for fome time at a lofs to account on 
what principle they could retain their eleftricity j but 
having at length remarked, that electrified bodies, 
infulated with fealing-wax, preferved their electricity 
for a time in very damp air, I concluded that moil- 
ture is but a very flow condudor. 
Having, 
