[ *5 2 ] 
fervice to travellers, and be the means of laving 
the lives of numbers; and as fuch, cannot be made 
too public. 
P. S. Since the reading of the preceeding paper, 
I have taken an opportunity to repeat the moft 
interefting of the experiments therein recited ; 
and find no reafon to alter a tittle in my account 
of them. 
The 6th experiment I have alfo varied a little, 
as follows ; I placed the large copper ball, C, 
at fuch a di fiance from that in contadl with 
the jars, that on bringing down the charge by 
my difeharging rod, it feemed to remain almoft 
undiminifhed, though the rod was kept in contact 
with the prime condudlor a full minute. Then, 
repeating the experiment, with a point inftead of a 
knob, the charge was, in a great meafure, prefently 
drawn off lilently. Upon the whole, it appears 
that though a fharp point will draw off a charge 
of electricity filently, at a much greater diflance 
than a knob, yet a knob will be {truck with a full 
explolion, or {hock, the charge being the lame in 
both cafes, at a greater diftance than a fharp point; 
and this, I imagine, completely decides the ques- 
tion. which I propofed to examine. 
XIX. Re- 
