on Dr. ingenhousz’s Experiments. 1053 
of wood or metal, the balls will inftantly fly to either of 
thefe, and will frequently pile themfelves up between 
the glafs and the bottom of the box, eight or ten in a 
pile, and will remove themfelves, following the wood, 
Sec. to different parts of the glafs, till the charge is ex- 
hausted. Apply the glafs again to the conductor as be- 
fore, and when the motion of the balls nearly ceafes, 
remove the glafs, and place on each Surface a circular 
coating of metal, reaching within an inch of the edge of 
the glafs all round. Make a communication between 
thefe coatings, and the glafs will then fhew that tt has 
been charged, and will give a very lfrong fhock: this 
proves, that the eledtric matter did not abfolutely pafs 
through the glafs, but only adted on the eledlricity 
inherent in it in the manner explained by Dr. frank 
lin., 
The diredtion of the eledtric matter, in the dilcharge 
of the Leyden bottle, hath been Shewn in a variety ot 
methods (fee Philofophical Tranfadtions, vol. lxiv. and. 
lxvii.); but I fhall here mention one which, I think, 
a very curious addition to the number. Mr. lullin, oi 
Geneva, placed two wires, the one upon, the other un- 
der, a card, the ends of the wires, in contadt with the 
card, being about an inch from each other. This appa- 
ratus 
