[ 542 ] 
This may be done without going out of one’s 
room, and even in bed, where one might eafily be 
allured of the degree of the force of a ttorm, by 
the degree of the flrength of the commotions : and 
if we were loth to touch the iron wire with a finger, 
for fear of the pain, we might ufe a little plate or 
blade of tin, fattened to the end of a glafs tube. One 
anight, by this means, have the latisfaCfion of judg- 
ing of the degree of the ftrength of thunder. 
I forgot to obferve, that my iron bar was too near 
the neighbouring houfes, which greatly letten’d the 
electrical power. 
I beg, Sir, you will, in my name, allure the 
Royal Society of the fentiments of refpedt and ac- 
knowlegement, which I owe it, for the honour it 
has done me. I alfo repeat them to you, Sir, and to 
Mettieurs Wilfon, Pringle, and Knight ; and am, 
main ; of which I have the honour to give you an 
account. 
I was not a witnefs to the experiments, that were 
made on the firtt and fecond of this month in the 
garden of the Hotel de Noaillcs; becaufe I was then 
bufy in my chamber ; which I lhail mention by- 
and-by : but the following is what was told me, 
SIR, &c. 
Guill. Mazeas. 
Read Nov. 23, 
1752. 
SIR, 
R ? Sn Germain, July 12, 1752. 
N the firtt, fecond, and tenth of 
July, we had ftorms at St. Ger- 
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