f l 5 x ] 
upon the conductors on St. Paul’s cathedral, were 
not the effects of lightning, but proceeded from 
very different caufes. 
I have made many other experiments on the 
different effect of knobs or points, as oppofed to 
infulated electrified bodies but as they all con- 
cur, in eftablifhing and confirming the opinions 
before advanced, it feems unneceffary to men- 
tion them ; and the more fo, as 1 believe thofe 
already recited will be deemed fufficiently de- 
cifive without them,. 
Having now finifhed what I had to offer, upon 
the fubjeCt of pointed conductors, as being the 
moft proper for the fecurity of buildings, &c. 
I {hall add, by way of appendix, a very curious 
obfervation, relating to perfonal fecurity, which 
I find likewife among thofe of the learned Pro-* 
feffor winthrop, communicated to me by Dr. 
franklin. This gentleman, having remarked, 
that people {landing in an open plain, are by no 
means fecure from a ftroke of lightning, advifes 
thofe, who may be overtaken by a Dorm, in 
fuch a fituation, to retire within fome fmall 
diftance, as from thirty or forty, to ten or fifteen 
feet, of an high tree (perhaps about fifteen or 
twenty feet from the outermoft branches, may be 
as proper a diftance as any) or rather two fuch, if 
at hand, and there wait the event, but by no 
means to go under them. This advice will, 1 
believe, be acknowledged to be moft judicious, 
and, if properly attended to, may be of great 
fervice 
