[ 6 1 9 ] 
Wax to give it Eledricity, I brought it near the Fea- 
ther, which it attraded ftrongly, though it had repelled 
it before, when the Feather had been made cledric 
by Wax. 
Afterwards I made the Feather eledric by the Wax, 
which firft attraded and then repelled it : And, having 
applied the rubbed Tube to the Feather, it attracted 
it ftrongly, though it repelled it when the Feather 
was made eledric by another glafsTube. 
XXI. Electrical Experiments made before the 
Royal Society, on Thurfday, March 
1 5 th 1740-1. by the Same . 
H Aving fhewn lately by fome plain Experiments, 
that the Eledricity of Glafs is different from 
that of Sealing-wax } becaufe the Wax attraded a 
Feather fufpended in the Air by a fine Silk, when the 
rubbed glafs Tube repelled it, (as deferibed in the 
Account of thofe Experiments) I made the Experi- 
ment with a Cake of Rofm inftead of Sealing-wax ; 
and it appeared to have the fame kind of Eledricity 
as the Sealing-wax. Then confidering that the Sup- 
porters of any non-eledric Conductors of Eledricity 
muft themfelves be eledric, I had a mind to try 
whether Bodies, endued with either kind of Eledri- 
city, were in any- wife different in that Cafe; which 
1 did by the following Experiments: 
I laid a Piece of Wood, Four Foot long, on Two 
glafs Plates, whofe Ends flood One Foot beyond the 
Side of the Table on which they were laid: Then, 
ap- 
