( pi ) 
To, I conclude from this Particular : That when I had 
warm’d the Glafs by the Fire, or had evaporated the 
Humid Efflfivia by any of the other means, I found I 
could give Motion to the included Brafs Bodies, by only 
rubbing my Finger on the outfidc of it, without the 
afliftance of the Wax. But at fuch a time when the well 
rubb’d Wax was held over it, the Motion of thofe Bo- 
dies would be much encreas’d ^ and ’twas obfervable, 
that fometimes the Brafs Bodies would continue to be in 
Motion, after the Wax was withdrawn from them. But 
if the Air be naturally warm, and free from Humid Va- 
pours, there needs none of the prementioned means to 
affift the Effluvia of the Wax to give Motion to the in- 
cluded Brals Bodies ; Yet at the fame time I muft believe, 
that the Particles of the Glafs are then in a greater Mo- 
tion, than when the Experiment will not fucceed. And 
Yis very probable I had never difeovered this odd Eh<eno- 
menon^ had I firft attempted it at an improper Temperature 
of the Air 3 which will caution me another time in Ex- 
periments of this Nature, not to conclude till I have had 
lecourfe to fuch helps as juH: now related. What farther 
I have to take notice of is, that the Effluvia of the Wax 
may very fenfibly be felt on the Back of the Hand, the 
Wax being mov’d to and fro near it, as I have formerly 
taken notice of the like fenfible Stroaks given by the 
Effluvia of Glafs. 
III. Jn 
