C "7 ] 
obferve it, by keeping his Eye fix’d upon a Point at 
a confiderable Diftance, in the fame Line with the 
End of Mr. JVheler^ Finger, and his own Eye. 
Yet when Mr. Wheler had finifli’d the Experiments 
to the Satisfadion of all prefent, Mr. Hawskbee, Mr. 
George Graham^ and Dr. Mortimer-, held the Thread 
with the pendulous Body over the Cake with the Ball 
on its Centre, after the Cake had been excited by 
Mr. Wheler j but they had no regular Revolutions at 
all, though fevcral very manifeft Motions were made 
with the Hand, to try if a projedile Motion might 
by that means be given to the pendulous Body. Mr. 
Wheler had tried the fame thing with his Servant f 
from whence it is rcafonable to conclude, that it is 
neceflary, that the fame Perfon who excited the Cake 
fhould likewife hold the Thread; as if there were 
fome Analogy between the Effluvia excited by the 
clapping of the Hand on the Cake, and the Effluvia 
which may be communicated along from the Hand 
which holds the Thread to the Piece of Cork at the 
End of it. And this feems to be the Reafon of 
what the late Mr. Grey told me, viz. That there 
was fomething in the human Hand elTential to the 
Experiment, which he had not yet found in any other 
Supporter of the Thread. 
L 
IV. A 
