[ 2 oS ] 
not returning to it again, until, by coming near, or 
touching, fome non-eleCtric Body, the Effluvia are 
drawn off from it. 
From this Property it is, that thefe Effluvia ex- 
pand themfelvcs with fo great a Velocity whenever 
they arc feparated from the ele&ric Body ; and as 
they are likewife capable of being greatly condenfed, 
may we not from hence juftly conclude they are 
claftic ? 
That there is a mutual AttraClion between thefe 
Effluvia and molt other Bodies, appears from their 
collecting from the Tube fuch Quantities thereof, as 
to endue them with the fame Properties with the 
Tube itfelf, as was proved by the 3 d, 4th, and 5 th 
but more particularly by the 6th Experiment. 
Thefe Principles being admitted, it will follow, 
that the greater Difference there is in the Quantity 
of cleCtrical Effluvia in any two Bodies, theftronger 
will be their Attraction. For, if the Effluvia in 
each are equal, inftead of attracting, they will repel 
each other j and in proportion as the Quantity of 
elcCtric Matter is drawn from one of the Bodies, 
will the Attraction between them increaie, and con- 
lequently be ftrongeft, when any one of them has 
all the elcCtrical Matter drawn from it. 
The Particles of thefe Effluvia are fo exceedihg 
fmall, as eafily to pervade the Pores of Glafs, as is 
evident, in that a Feather, or any light Bodies in- 
clofed in a glafs Ball hermetically fealed, will be 
put in Motion on the excited Tube being brought 
near the Outfide of it ; and it has been generally 
thought that they pafs through the Pores of the 
denfeft Bodies 5 and there are leveral Experiments 
which 
