[ 209 3 
account of an experiment, which Mr. Jallabert had 
fome time fince made at the water-works at Geneva. 
An account of this experiment was communicated 
by myfeif to the Society j and it has near relation to 
the experiment, which we made here in eleCtrifing 
the river Thames fix years ago. Mr. Jallabert con- 
fults the Abbe Nollet in relation to the folution of 
the phenomena of this experiment ; and the Abbe 
does me the honour now to give the fame folution 
thereto, which I firft gave to a fimilar experiment of 
Dr. le Monnier’s, and laid before the Society in 
January * 174 6, and fince applied upon other occa- 
cafions in illuflrating the electrical circuit. 
The ninth letter is addreffed to Mr. Bofe, profef- 
for of mathematics and philofophy at Wittemberg 
and is in anfwer to one of Mr. Bofe, in which this 
gentleman expreffes himfelf furprifed, that fo many 
ages have palled, without it having been difcovered, 
that thunder eleCtrifes bodies ; fince it depends upon 
an experiment fo fimple,' and which it is hardly pof- 
fible to fail in, when you defire to repeat it under 
proper circumftances. 
Upon this our author obferves, that people in ge- 
neral only fee the facts, and are ignorant of, or do 
not confidcr, the means, by which philofophers arrive 
at them ; nor perceive the circumftances, without 
which thefe phenomena could never have been made 
known to us ; and that Mr. Bofe will ceafe to be fur- 
prifed, as he is fo well verfed in thefe phenomena, 
when he reflects upon what our author offers. 
* See Phil, Tranf. Vol. XLIV. p. 388. 
D d 
To 
