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thefe Objections anfwer’d) that this Appearance of 
Light is no Proof that the Effluvia iffue out of the 
Non-eleCtric, but of the direCt contrary. 
The above-mentioned Objections might be brought, 
with equal Force, againft the Fibres of the Feather being 
repelled by Effluvia ifiuing out ot the Point of the 
Non-eleCtric that is held near it, and in particular, 
that this EfFcCt would ceafc to be produced, either 
when the Machine was (topped, or the Perfon who 
held the Point became electrical. And to thefe I 
would add, that it this was really the Cafe, the Fi- 
bres would continue to be repell d, notwithftanding 
any Alteration in the Shape of the Non-elecliic ; 
whereas, on the contrary, it the Joint ot a Pair of 
Compafles was held towards them, inftead ot the 
Point, they would be ftrongly attracted to it : And 
the fame will always happen, whenever an obtule 
Body is brought near them inft ead of a pointed one. 
The true Caufe of this remarkable Thanomenon 
I apprehend to be the different Denfity of the Ef- 
fluvia at the Extremities of the two Bodies ; for I 
have already fhewn the Effluvia will be much denfer 
at the Extremity of a pointed Body than at an ob- 
tufe one : And as the Force by which the Particles 
endeavour to expand themfelves, increafes in propor- 
tion to their Denfity, it follows, that the Particles 
will be reflected back with greater Violence from 
the pointed Body than the other; and this Force ex- 
ceeding the attractive Power of that particular Part 
of the Feather, to which it isdireded, the Fibres will 
be repelled by it; whereas the Force, with which 
the Particles endeavour to expand themfelves from 
the obtufe Body, being lefs than the attractive Power, 
