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tails and Tourmalin towards the glafs : becaufe I 
found that a current of the eledtric fluid adting again 
the natural quantity of the fluid in the glafs will pro- 
duce the fame eAredt : for having rubbed a tube ot 
alafs, I applied it to the heated end of another tube, 
and the appearances were exadtly alike ; that part 
which was heated being minus, and the part beyond 
'This feems a leading ftep, towards difcovering the 
truth we are in fearch after : for the curient of the 
fluid feems to be fairly traced in thefe circumdances, 
the heat having difpofed the Tourmalin y roperly to 
let the fluid pafs from the balls , through its fubjtance, 
towards the glafs. 
Exp. 10. I was now eager to try what would be 
the event, when the heated part of the glafs was next 
the convex lide of the Tourmalin. Upon making the 
experiment, I found that the tube was eledtiified mi- 
nus above one foot in lengthy without the lead appeai- 
ance of a plus eledricity beyond the minus one, as in 
the lad experiment. And this minus appearance con- 
tinued alfo when the tube was nearly cold. 
Now becaufe the Tourmalin w as plus , the balls plus 
alfo and the heated glafs minus , the eledhic fluid 
mujl have flowed from the glafs to produce a plus elec- 
tricity in the done and balls. 
Thus you fee, Sir, I have difeovered two currents 
of the eletfric fluid palling in contrary directions, the 
one of them electrifying both fides of the Tourmalin 
plus , and the other both fides minus. 
MY next Aep was to put the Tourmalin into its 
natural date (as JEpinus calls it,) in order to make 
farther experiments. 
