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II. Mr. Stephen Gray, F. R. S. his lafi 
Letter to Granville Wheler, Efq' y 
F. R. S. concerning the Revolutions 
which [mall pendulousBodies will , by 
Electricity, make round larger ones 
from JVeft to Eaft as the Planets do 
round the Sun. 
I HAVE lately made feveral new Experiments up- 
on the proje&ile and pendulous Motion offmall 
Bodies by Eletftricity, by which frnall Bodies may 
be made fo move about larger ones, either in Circles 
orEllipfes, and that either concentrical or excentri- 
cal to the Center of the larger Bodies about which 
they more, fo as to make many Revolutions about 
them ; and this Motion will be conftantiy the fame 
Way that the Planets move about the Sun, viz. from 
the Right to the Left, or from Weft to Eaft : But 
thefe little Planets , if I may fo call them, move much 
falter in their Apogeon , then in the, Perigeon Parts 
of their Orbits ; which is, as you very well know, 
dire&ly contrary to the Motion of the Planets about 
the Sun. I have not yet communicated thefe Ex- 
periments to the Royal Society, being in hopes of 
making fome farther Difcovery, or at leaftof lhewing 
them after feme what more elegant a manner than 
I make them at prefent, when you may expedl to 
hear a farther Account of them from 
SIR, 
London, Feb. <>\ h. Tour moji Obedient 
Humble Servant , 
Stephen Gray. 
