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matter. Some of the experiments of our author up- 
on this fubject I heretofore did myfelf the honour to 
lay before you j and they are in my opinion fully con- 
clufive. 
The fourth letter to Mr. Franklin relates to feve- 
veral phenomena of the experiment of Leyden. In 
this letter it is examined, whether the effects of this 
experiment proceed from the glafs phial, or from the 
non-electrics contained therein ; and experiments are 
produced to prove, that the power of giving a fhock 
in an electrifed phial of water, proceeds from the 
water in the phial, and not from the phial itfelf, as 
Mr. Franklin imagines. In this letter likewife is an 
examination of Mr. Franklin’s opinion, that, in the 
charged phial, as much fire as is received by one of 
its furfaces is loft by the other. 
The fifth letter to Mr. Franklin is in relation to the 
power of pointed non-eleCtric bodies drawing oft and 
throwing off electrical fire, at a much greater diftance 
than obtufe bodies do of the fame kind. Our author 
thinks, that Mr. Franklin has attributed more power 
to pointed bodies, than, upon experiment he finds to 
be true. 
The fixth letter to Mr. Franklin is upon the ana- 
logy of thunder with electricity. This is a faCt at pre- 
fent fo well eftablifhed, as to admit of no doubt. 
But our author cannot agree with Mr. Franklin in his 
opinion, “ that thunder is at prefen t in the power of 
u men, and that we are able to diffipate it at our 
“ pleafure : that an iron rod (fuch a one as Mr. 
« Franklin has directed, and fuch a one as has been 
“ m ade ufe of} is fufficient to difcharge of all its fire 
a a 
