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by Eleflricity with regard to light Subfiances both 
111 its Attraction and Repulfion s but 1 have never 
been able* to difcern that vortical Motion, by which 
this EffeCt was faid to be brought about by the late 
Dr. 'Defaguliers and others, having no other Con- 
ception of the Manner of its aCting than as Rays 
' from a Centre, which indeed is confirmed by feve- 
rai Experiments : One of which, very eafy to be 
tried, is, that if a Tingle downy Seed of Cotton-grafs 
is dropped from a Man's Hand, and in its Fall comes 
within the Attraction of the rubbed Tube, the Down 
of this Seed, which before feemed to (tick together, 
feparates, and forms Rays round the Center of the 
Seed. Or if you fatten many of thefe Seeds with 
Mucilage of Gum Arabic round a Bit of Stick, the 
Down of them, when electrified, which otherwife 
hangs from the Stick, is raifed up, and forms a cir- 
cular Appearance round the Stick. As thefe light 
Bodies are directed in their Motions only by the 
Force impreffed upon them, and as their Appearance 
is conftantly radiatim , fuch Appearance by no means 
fquarcs with our Idea of a Vortex. Some have ima- 
gined a Polarity alfo, when they have obferved one 
End of an excited glafs Tube repel light Subflances,, 
and the other attraCt them. But this is a Deception 
arifing from the whole Length of the Tube not 
being excited, but only fuch Part of it as has been: 
rubbed 5 fo that as much of the Tube as is held in 
the Hand remains in an unexcited State, and per- 
mits light Subflances to lie (till thereon, though 
forcibly repelPd at the other End. This attractive 
Power of EleCtricity aCts not only upon Non-elec- 
trics, as Leaf-Gold, Silver, Thread, and fuch-like, 
but 
