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held them in my hands they hung down collapfed, 
and did not more attract one another, than before 
they were put upon my leg. I repeated the experk 
ment two or three times, but with no better fuccefs. 
An event I fo little expected, difconcerted me much. 
I faw I was no longer to afcribe electricity to the com- 
bination of filk and worfted; but I remained at a lofs 
to know to what I jhould afcribe it. At laft, upon 
confidering the circumftances of this and other expe- 
riments, a conjecture occurred, that the electricity in 
queftion might depend upon the nature of different 
colours. In order to determine this, I thought it 
faireft to make the trial in the fame fubftances. Ac- 
cordingly I had recourfe to the following experiment. 
I took a pair of white filk ftockings, and having 
warmed them at the fire put them both upon the 
fame leg. After I had worn them about ten minutes, 
I took them off, and pulled them alunder, but difco- 
vered no figns of electricity in either. I did the fame 
with a pair of black filk, but to no other effect. I 
then proceeded to the decifive trial. I put a black 
and a white flocking upon my leg, and wore them 
likewife ten minutes. 1 waited with fome impatience 
to fee the fuccefs of my experiment, and in return 
had the fatisfa&ion of obferving, upon their being 
pulled afunder, that each of them had acquired a 
ftronger degree of electricity than I had before feen : 
they were inflated fo much, that each of them fhewed 
the entire fhape of the leg, and at the diflance of a. 
foot and a half they rufhed to meet each other. I 
went through the fame experiment with worfled 
ftockings, and found that, as in filk, nothing but the 
combination of black and white produced electricity. 
As 
