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Having made a great number of experiments fince 
I had the honour of prefenting my former paper to 
the Society, I have had an opportunity of obferving, 
that the electricity produced between black and white 
filk, is ftronger than that between filk and worfted 
of thofe different colours, and a great deal ftronger 
than that between worfted and worfted : the laft is 
fo weak, except in time of froft, or when a fharp 
north-eaft wind blows, that tho’ the effeCts are always 
of the fame nature, yet they are fometimes fo languid 
as to be fcarce perceptible. I fhall therefore, and for 
the fake of brevity, confine myfelf, in this paper, to 
what is obferveable with regard to the electricity be- 
tween black and white filk. 
It is proper to mention another circumftance : 
having found it troublefome to eleCtrify the flock- 
ings, by putting them as often on my leg as was re- 
quifite in making experiments, I have quitted that 
method intirely ; and fatisfy myfelf with the degree 
of eledricity which is excited in the ftockings by 
drawing them upon the hand : and this is to be un- 
derftood with regard to all the experiments and ob- 
fervations I may have occafion to mention, unlefs 
when otherwife expreffed. The eleClricity thus pro- 
duced is not equally powerful with that which is ex- 
cited by means of the leg ; but it is neverthelefs fuf- 
ficiently ftrong to anfwer all the purpofes in view ; 
and it is attended with this advantage, that the 
ftockings continue longer fit for thefe experiments : 
for, like other eleCtrical aparatus’s, they muft be kept 
clean, and free from all extraneous matter ; and are 
therefore moll to be depended upon when new, or 
when newly wafhed. 
To 
