By some the sphere, S, is called the inductive, and the
cylinder, A B, in this experiment, the inductric body.
559. If the finger be presented to either end of the cyl-
inder, AB, while under the influence of the excited
sphere, S, a spark will be received ; and on the removal

uneleetrified 1 When the excited sphere. S, is brought near the insulated cylinder.
A B, what effect is produced upon the natural electricity in A B 1 658. If the sphere,
8, had been negatively electrified, what would have been the result 1 If the excited
body is removed, what will be the effect 1 559. If, while the sphere, S, is near A B, the
finger is presented to one of its ends, what will be the effect) If the sphert be now



354 IfATUBAL PHILOSOPHT.
of the sphere, A B will not be neutral, as before, but there
will be an excess of one or the other, according as the
finger may have been presented to the positive or nega-
tive (558) part of the cylinder.
If the inductive sphere had been placed near the centre
of the ^cylinder, then both extremities would have the
same electricity as the sphere, and the centre the opposite
kind. In any case that part, or those parts, of the induo-
tric (it being supposed to be insulated) furthest from the
inductive will have the same, and the part nearest to it
the opposite kind of electricity from that of the inductive.
