[ 3Si ] 
excited tube, they may attrad and condenfe the elec- 
trical fluid round about them, and be feparated by the 
repulfion of its particles. It is conjedur ’d alfo, that 
the balls at this time contain lefs than their common 
fhare of the eledrical fluid, on account of the repel- 
ling power of that which furrounds them ; tho’ fome, 
perhaps, is continually entering and palling thro’ the 
threads. And if that be the cafe, the reafon is plain, 
why the balls hung by filk, in the fecond experiment, 
muft be in a much more denle part of the atmo- 
fphere of the tube, before they will repel each other. 
At the approach of an excited flick of wax to the 
balls, in the firft experiment, the eledrical fire is 
fuppofed to come through the threads into the balls, 
and be condenfed there, in its paffage towards the 
wax : for, according to Mr. Franklin, excited glafs 
emits the eledrical fluid, but excited wax receives it. 
Experiment 3. 
Let a tin tube, of four or five feet in length, and 
about two inches in diameter, be infulated by filk ; 
and from one end of it let the cork-balls be fufpended 
by linen threads. Eleftrify it, by bringing the ex- 
cited glafs tube near the other end, fo as that the balls 
may Hand an inch and an half, or two inches apart : 
then, at the approach of the excited tube, they will 
by degrees lofe their repelling power, and come into 
contad ; and as the tube is brought flill nearer, they 
will feparate again to as great a diflance as before: 
in the return of the tube they will approach each 
other till they touch, and then repel as at firft. If 
the tin-tube be eledrified by wax, or the wire of a 
charg’d 
