C <537 3 
Effluvia will flop at the firft of them, unlefs the 
Interruption or Difcontinuation of the Non- eledric 
be fhort; becaufe in that Cafe the Eledricity jumps 
from the End of the firft Non- eledric to the Begin- 
ning of the next, cfpecially if the Air be very dry, 
even though the Ends of the String fhould be about 
a Foot diftant, and no Body but the Air between. 
Sometimes indeed the Diftance rauft not be above an 
Inch or two. 
There are Two Sorts ofEledrics per fe, known by 
what follows: A Body impregnated with Eledricity 
from one Sort will repel all Bodies that have that 
Sort of Eledricity, till they have loft their own 
Eledricity by coming to forne Non eledric. But an 
Eledric per fe of the other Sort, though excited, will 
attrad all thofe Bodies, though in a State of Repul- 
fion on account of the other Eledricity ; and fo 
vice verfa. 
XX. An Account of feme Electrical Experi- 
ments made before the Royal Society, 
on Thurfday the nd of January 1740- 1. 
by the Same . 
I T being a Matter in Difpute, whether there is 
any Difference between the Eledricity of Glafs, 
and that of Gums and Refins, I made the following 
Experiments, in order to fettle that Point : 
I fattened a String of dry Cat-gut (which, when dry, 
is an Eledric per fe) from one Pillar to the other, at 
the End of the Table in the Meeting-Room of the? 
Nnnn 2 Royal 
