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State to a ftrong Electricity ; whereby It flies from 
the Tube, repels and is repell’d by the Air, where 
meeting with very few Vapours, it retains its Elec- 
tricity a long time ; till touching a Non-eleCtric, that 
is brought to it, it lofes its own Electricity by com- 
municating it, becomes a Non-eleCtric, and is re- 
attraCted by the Tube, to which adhering fome time, 
it receives fo much Virtue from the Tube, as to be 
reftor’d to its Electricity, and again repcll’d. 
In a moift State of the Air, the Feather, after 
it has been made electrical, and repell'd by tire 
Tube, it attrads to it the moift Vapours floating 
in the Air; whereby lofing its Electricity, it is at- 
rraCted by the Tube, without touching any other 
Body firft. 
Sometimes, when the Feather flics off from one 
Part of the Tube, it immediately returns to another 
Part, generally the Top of the Tube, becaufe the 
Top of the Tube has attracted the moift Vapours, 
and is become a Non- eleCtric, and therefore attracts 
the Feather j which being become eleCtric, flew off 
from the eleCtric Part of the Tube. 
That this is true, appears from an Experiment to 
be made in dry Weather. 
At that Time, when every Part of the Tube 
repels the Feather ftrongly, after having attracted 
it, if you wet two or three Inches of the upper 
End of the Tube, the Feather will come to that 
End. 
Wetting the Silk by which the Feather hangs from 
the Cat-gut, the Feather will be always attracted, and 
not repell’d. 
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When 
