[ 37 ° ] 
flicks to the tube, will injure its electricity : Now 
this is what may eafily be wiped off from glafs ; but 
it may be very difficult to clear the filk of it, as ffik 
is of a nature more apt to imbibe, and to retain ex- 
traneous matter than glafs. — From thefe con fide ra- 
tions, I fhould not be furpriied at any perlons being 
difappointed, as to the fuccefs of their experiments, 
in a few trials; but I fhould think it not fair for them 
to conclude from thence, that thofe above-recited are 
not to be depended upon Vet, if any member of 
the Society, who is curious in thefe matters, hath not 
been able to fatisfy himfelf with regard to any parti- 
cular experiment, I fhall think it no trouble to ffiew 
him, at any proper time, how it fucceeds with me. 
* The circumflances neceflary to be attended to, in order to 
procure the moft coniiderable appearance of electricity, are as fol- 
low. i°. That the wind be in the north, north eafl, or eaft ; the 
weather clear and frofly, or inclining to froff. 2°. That the dock- 
ings be of filk ; one of a good black, the other of a clear white ; 
and both of the fame fize and fubltance. 3 0 . That they be new; 
or be kept carefully wrapt up in paper, and only ufed in electrical 
experiments, 4 0 . And lafily. That they be dried before the fire, 
and warmed to about the degree of heat of the human body, before 
they be drawn upon the hand or leg. And when taken off, care 
fhould be had in feparating them, fo as to keep them at a diftance 
from one’s clothes, or any thing that may leflen their virtue. 1 he 
circumflances above-mentioned, might be gathered from what has 
been faid in thefe papers ; but I thought it not amifs to bring them 
together in this note. 
NlIV 
