110 Answer to Dr. Hare’s Letter. 
each other. A and C will not be in this polarized state, for they 
will each be as it is said charged (iii); the one positively, the other 
negatively ; and they will present no polarity as far as this partic- 
ular act of induction (iv) is concerned. 
vi. That one part of A is more positive than another part does 
not render it polar in the sense in which that word has just been 
used.. We are considering a particular case of induction and have 
to throw out of view the states of those parts not under the in- 
ductive action. Or if any embarrassment still arise from the fact 
that A is not uniformly charged all over, then we have merely to. 
surround it with balls such as B and Con every side so that its 
state shall be alike on every part of its surface, (because of the 
uniformity of its inductive influence in all directions,) and then 
that difficulty will be removed. A, therefore is charged but not 
polarly, B assumes a polar condition, and C is charged inducteously 
(1483); being, by the prime influence of A brought into the op- 
posite or negatively electrical state through the intervention of the 
intermediate and polarized ball B. 
vii. Simple charge therefore does not imply polarity in the body 
charged. Inductive charge (applying that term to the sphere B 
and all bodies in a similar condition (v)) does (1672.) The 
word charge, as applied to a Leyden jar or to the whole of any 
inductive arrangement, = including ali the effects, comprehends 
of course both these states. 
- vill. As another nan of my hacky: 1 will put the follow- 
ing case. Suppose a metallic sphere C formed of a thin shell a 
foot in diameter; suppose also in the centre of it another metallic 
sphere A, only an inch in diameter; suppose the central sphere 
A charged positively with electricity to the amount we will say 
of 100: it would act by induction through the air, lac, or other 
insulator between it and the large sphere C ; the interior of the 
latter would be negative, and the exterior positive, and the sum 
of the positive force upon the whole of the external sphere would 
be 100. The sphere C would in fact be polarized (v) as regards 
its inner and outer surfaces. 
ix. Let us now conceive that instead of mere air or other insu- 
lating dielectric within C, between it and A, there is a thin metal- 
lic concentric sphere, six inches in diameter. This will make no 
difference in the ultimate result ; for the charged ball A will ren- 
der the inner and outer surfaces of the sphere B negative and 
~ 
