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it comes to be better underflood, may throw much 
light upon the fyflem of electricity. However that 
may be, it was impoflible for me not to obferve, that 
it runs through the whole of that branch, which I 
have at prefent under examination, and to which I 
return. 
White filk differs much in electricity from black 
lilk. When the white flocking is drawn feparately 
upon the hand, no crackling is heard, nor fparks of 
fire feen in the dark, let it be pulled backward and 
forward ever fo often : when another white flocking 
is drawn on above it, nothing more appears : and, 
when feparated from the hand, neither of them dif- 
covers any figns of electricity, excepting that, when 
brought within a few inches of the electrometer, they 
attrad and repel the balls a little. 
If inflead of two white or two black (lockings, one 
white, and over that, a black flocking be drawn up- 
on the hand, they difcover not the leafi figns of elec- 
tricity while they continue upon the hand, even tho’ 
they fhould be drawn backwards and forwards upon 
it feveral times ; nor, when taken together from the 
hand, and prefented to the eleClrometer, do they ap- 
pear to have acquired any more than a very fmall de- 
gree of eleClricity. They mufl be brought within 
the diflance of a foot, nay, fometimes of a few 
inches, before they have any effeCt upon the balls : 
but the moment they are feparated, they are found to 
be both of them highly eleCcrified, the white pofi - 
tively , and the black negatively. The circum- 
flances, that appear the mofl to merit obfervation, 
are as follow : 
i 
O 
