( M 8 ) 
V. A Letter from Monf. Du Fay, F. 5. and 
of the (Royal Academy of Sciences at Paris, to 
bis Grace CHARLES Duke of Richmond 
and Lenox, concerning Electricity. Tranjla~ 
ted from the French by T. S. M D. 
Paris , December 17, 1733. 
My LO R D , 
I Flatter my felf your Grace will not be difplea- 
fed with an Account of fome extraordinary Dis- 
coveries I have made in the Electricity of Bodies, 
nor refufe the Favour I have to aik, that it may be 
communicated to the Royal Society. I owe this 
Homage to that Illuftrious Body, not only as a Mem- 
ber thereof, but in this refpeft as a Debtor to their 
Works; for the Writings of Mr .Gray, and the late 
Mr. Hauksbee, both of that Society , firft put me 
upon the Subje£f, and furnidi’d me with the Hints 
that led me to the following Difcoveries. 
Firft, I have found that all Bodies (metallick, 
foft or fluid ones excepted) may be made Eleftrick, 
by firft heating them more or lefs, and then rubbing 
them on any fort of Cloth. So that all kinds of 
Stones, as well precious as common, all forts of 
Wood, and in general every thing that I have made 
Trial of, became EleCtrick, by heating and rubbing; 
except fuch Bodies as grow foft by Heat, as the 
Gums, which diflolve in Water, Glue, and fuch 
other Subftances. » Fis alfo to be remark'd, that the 
hardeft 
