C 385 ] 
difference between them : For after the glafs plates 
have been electrified in one petition, fo as to be inca- 
pable of receiving any more electricity, if they be in- 
verted, and in that new pofition prefented to the 
chain and wire, and the globe again be put in motion, 
according as one or other of thofe opinions holds, 
correfpondent effeCts will follow. If the eleCtricity, 
that comes by the chain, be of the fame nature with 
that which comes by the wire, no change will be 
produced upon the plates ; for being before full of 
one and the fame kind of electricity, they can do no 
more than keep what they had, or exchange it for 
jufi: as much of the fame kind. But if, by the chain 
and the wire, two kinds of electricity, totally differ- 
ent in their nature, be conveyed into the refpeCtive 
plates, in that cafe it is to be expeCted, that the elec- 
tricity that each of them had acquired in their former 
pofition, will be gradually destroyed, till no figns of 
electricity appear in either ; after which, they will 
begin again to be eleftrified, having their eleClricity 
reverfed. 
In order to fee what would really happen, I re- 
peated the experiment in the following manner: I 
electrified the two plates till they were fully charged, 
and in ffrong cohefion, the flapping from the chain 
and the wire having totally ceafed. I then turned 
them upon the gkfles that fupported them, applied 
the chain and the wire to the different fides, and be- 
gan to eleCtrify as before. The glafs globe was no 
fooner in motion, than the flapping from the chain 
and the wire returned with violence ; and the plates, 
which, in the former pofition, would receive no more 
eleClricity, appeared, in their new fituation, to receive 
Vo l. LI. D d d it 
