These appearances we attempt to account for thus. We suppose as aforesaid, that electrical fire is a common element, of which every one of the three persons abovementioned has his equal share, before any operation is begun with the Tube. _A_, who stands on wax and rubs the tube collects the electrical fire from himself into the glass; and his communication with the common stock being cut off by the wax, his body is not again immediately supply'd. _B_, (who stands on wax likewise) passing his knuckle along near the tube, receives the fire which was collected by the glass from _A_; and his communication with the common stock being likewise cut off, he retains the additional quantity received.--To _C_, standing on the floor, both appear to be electrised: for he having only the middle quantity of electrical fire, receives a spark upon approaching _B_, who has an over quantity; but gives one to _A_, who has an under quantity. If _A_ and _B_ approach to touch each other, the spark is stronger, because the difference between them is greater; after such touch there is no spark between either of them and _C_, because the electrical fire in all is reduced to the original equality. If they touch while electrising, the equality is never destroy'd, the fire only circulating. Hence have arisen some new terms among us: we say, _B_, (and bodies like circumstanced) is electrised _positively_; _A_, _negatively_. Or rather, _B_ is electrised _plus_; _A_, _minus_. And we daily in our experiments electrise bodies _plus_ or _minus_ as we think proper.--To electrise _plus_ or _minus_, no more needs to be known than this, that the parts of the tube or sphere that are rubbed, do, in the instant of the friction attract the electrical fire, and therefore take it from the thing rubbing: the same parts immediately, as the friction upon them ceases, are disposed to give the fire they have received, to any body that has less. Thus you may circulate it, as Mr _Watson_ has shewn; you may also accumulate or substract it upon or from any body, as you connect that body with the rubber or with the receiver, the communication with the common stock being cut off. We think that ingenious gentleman was deceived, when he imagined (in his _Sequel_) that the electrical fire came down the wire from the cieling to the gun-barrel, thence to the sphere, and so electrised the machine and the man turning the wheel, _&c._ We suppose it was _driven off_, and not brought on thro' that wire; and that the machine and man, _&c._ were electrised _minus_; _i. e._ had less electrical fire in them than things in common.