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ther obferved, that thofe Bodies in which the elec- 
trical Quality is capable of being excited the ftrongeft 
by Friction will receive the lead Quantity of it from 
any other excited Body, and therefore are properly 
made ufe of to fupport any Body defign'd to re- 
ceive the ele&rical Virtue. The Truth of this will 
fufficiently appear from the following Experiment. 
Exp. V. 
Hang up two Lines, one of Silk, and the other 
of Thread; that of Thread will be attracted by the 
Tube at a much greater Diftance than the Silk. 
Again ; Fallen to each String a Feather, or other 
light Body ; if the Tube is brought to the Feather 
fallen ed to the Silk, it will be firft attracted, and 
afterwards repelled ; and from the Virtue commu- 
nicated to it from the Tube, the feverai Fibres of 
the Feather will ftrongly repel each other. But 
when the Tube is brought to the Feather fattened 
to the Thread, the Feather will be ftrongly attracted, 
and continue to be fo, without ever being rcpell'd, 
the Virtue patting off by the Thread it is hung to. 
If a glafs Ball is hung to the filk Line, it will be 
but weakly attracted by the Tube ; but one of Cork 
or Metal much ftronger. 
Exp. VI. 
Let a Rod of Iron be fuftained by filk Lines, and 
by means of a glafs Sphere (which can be more re- 
gularly and conftantly excited than a Tube) be made 
electrical s it will be found to have all the Proper- 
ties of the excited Tube mention’d in Exp. i. A 
Stream 
