C 43 3 
iffue fucceffively as long as the Bodies, from which 
they proceed, are exciting; but they are longer and 
more brilliant, if you bring any Non-eledric not 
excited neat them, though it mud not be clofe enough 
to make them fnap. If you hold your Hand at about 
two or three Inches Diftance from thefe Points, you 
not only feel fucceffive Blafts of Wind from'them, 
but hear alfo a crackling Noife. Where there are 
feveral Points, you obferve at the fame time feveral 
Pencils of Rays. 
It appears, from Experiments, that befides the fe- 
deral Properties that Eledricity is poflefs’d of peculiar 
to itfelf, it has fome in common with Magnetifm 
and Light. 
Proposition I. 
In common with Magnetifm Eledricity counter- 
ads, and in light Subftances overcomes the Force of 
Gravity. Like that extraordinary Power likewife, it 
exerts its Force in Vacuo as powerfully as in open 
Air, and this Force is extended to a confiderable 
Diftance through various Subftances of different Tex* 
tures and Denfities. 
Corollary. 
Gravity is the general Endeavour and Tendency of 
Bodies towards the Centre of the Earth : This is over- 
come by the Magnet, with regard to Iron, and by 
Eledricity, with regard to light Subftances, both in 
its Attradion and Repulfion } but I have never been 
able to difeern that vortical Motion, by which this 
F a Effed 
