f.io] 
nutes, and the Revolutions performed in about feven 
or eight of them. I obferved each of thefe three 
laft times, it was rather longer before the progreffive 
Motion began than ufual 5 and in all the Trials of this 
Experiment, I frequently perceived a Motion about 
the Axis, which was generally from Weft to Eaft, 
though now-and-then the contrary Way. The Virtue 
of the Cake muft now have lafled near two Hours } 
about three quarters of an Hour after, I tried again, 
and had fixty Revolutions from Weft to Eaft, in about 
ten Minutes, the Diftance from the Ball being ftill 
lefs than before, hardly one quarter of an Inch, fcarce 
any Revolution about the Axis appeared, and at the 
Beginning the Thread was twice attraded to the Ball. - 
About an Hour and half after, the Virtue of the Ball 
was not quite gone, the wet Thread being repelled, 
and making three or four Revolutions from Weft to 
Eaft, as well as moving a little about its Axis the 
fame Way. But as it was reafonable to fuppofe the 
Ball itfelf in the Centre of the Cake was now dry, 
with a Feather dipp’d in Water I wet its Surface; 
yet found no Increafe of Virtue, rather a Diminution 
of ir, the pendulous Body feeming fcarce at all 
repelled ; but it is to be obferved, that the Ball, as it 
was wetting, twice tumbled over, and rolled upon 
the Surface of the Cake ; by which means the Virtue 
of the Cake might be much diminifhed. 
It is not improper too to take Notice here, that 
during the Revolutions of the wet String, I have fre- 
quently obferved a kind of Ofcillatory Motion, as 
if there was an alternate Intention and Remiflion 
of the repulfive Force. As alfo that I have often 
tock Notice of little Plucks, and convulfive Motions, 
in 
