[ 97 3 
thought of towards gaining a farther Infight into the 
Nature, Power, and Laws of Electricity. 
From the Time I faw thofe Experiments at your 
Houfe about 3 Years ago, I had little or no Oppor- 
tunity of making any myfelf, until within this Month j 
when, having got fome good Utenfils, I repeated or 
imitated moft of the Trials I had heard of, with Sue* 
cefs. And particularly having heard, that Mr. Gray 
gave an Account of Balls caufed to move round one 
another by means of electrical Effluvia, I was very 
defirous of feeing fo delightful a Sight *. And though 
I was difappointed in my Expectation of a circular 
Motion, yet I found it eafy to make two Balls act 
upon each other, in a very entertaining Manner, for 
a long time ; and that with fuch a Conftancy and 
Regularity, as to the Effect, that I apprehend one 
may thence deduce a Gauge or Standard, whereby to 
meafure electrical Powers, and compare the Quanti- 
ties and Strength of the Virtue infufed into, or remain- 
ing in, non-electrical Bodies after given Times, <&c. 
This, together with a great Defire to be able to 
eftimateand compare the Effects of Experiments with 
fome Certainty, and to do fomething more than 
amufe myfelf and Friends with the feveral furprifing 
*Phrenomena which thofe Experiments produce, led 
me, about 10 Days ago, to think of a Method, which* 
for aught I know, is quite new, and feems to pro- 
mife fair to afford much new Light: It is to try or 
weigh 
