Answer to Dr. Hare’s Letter. lll 
positive, and it again will render the inner and outer surfaces of 
the large sphere C negative and positive: the sum of the positive 
forces on the outside of C being still 100. 
x. Instead of one intervening sphere let us imagine 100 or 
1000 concentric with each other and.separated by insulating mat- 
ter, still the same final result will occur ; the central ball will act 
inductrically, the influence originating with it will be carried on 
from sphere to sphere, and positive force equal to 100 will appear 
on the outside of the external’sphere. - . ‘ 
~xi. Again, imagine that all these spheres are subdivided into - 
myriads of particles, each being effectually insulated from its 
neighbors (1679), still the same final result will occur; the in- 
ductric body A will polarize all these, and, having its influence 
carried on by them in their newly acquired state, will. exert pre- 
cisely the same amount of action on the external sphere C as be- 
fore, and positive force equal to 100 will appear on its outer sur- 
face. : 
xii. Such a state of the space between the inductric and in- 
ducteous surfaces represents what I believe to be the state of an 
insulating dielectric under inductive influence; the particles of 
which by the theory are assumed to be conductors’ individually 
but not to one another (1669). 
xiii. In'asserting that 100 of positive force will appear on the 
outside of the external sphere under all these variations, I pre- 
sume I am saying no more than what any electrician will admit. 
Were it not so, then positive and negative electricities could exist 
by themselves and without relation to each other (1169, 1177); 
or they could exist in proportions not equivalent to each: other, 
There are plenty of experiments, both old and new, which prove 
the truth of the principle, and I need not go further into it here. 
xiv. Suppose a plane to pass through the centre of this spherical 
system, and conceive that instead of the space between the cen- 
tral ball A and the external sphere C being occupied by a uniform 
distribution of. the equal metallic particles, three times as 
were grouped in the one half to what occurred in the other half, 
the insulation of the particles being always preserved: then more 
of the inductric influence of A would be conveyed outwards to 
the inner surface of the sphere C through that half of the space 
wits the ti ber of metallic particles existed than through 
ACL rr 
the other half: still the exterior of the outer sphere C would be 
