? 
Second Letter from Dr. Hare to Prof. Faraday. 3 
epithet to convey the idea which I have of the state of a mass 
a state of electropolarity. a Rom, 
_ It does not appear to me that in the suggestion of the electro- 
polarity which we both agree to be induced upon the body B, (iv,) 
so long as it concerns a mass, there is any novelty. ‘The only 
part of your doctrine which is new, is that which suggests an 
analogous state to be caused in the particles of the bodies through 
which the inductive power is propagated. Admitting each of the 
particles of a dielectric, through which the process of ordinary 
induction tak ; to be put into the state of the body B, it 
does not appe: e to justify your definition of electrical induc- 
tion. Lconceive that consistently with your own exemplification 
of that process, you should have alleged ordinary induction to be 
productive of an affection of particles causing in them a species of 
polarity. In the case of the bodies, A, B, C, (iv,) B is evidently 
passive. How then can we consider as active, particles repre-— 
sented to be in an analogous state? If in B there is no action, 
how can there be any action in particles performing a_ perfectly 
similar part ? Moreover, how can the inductive power of an elec- . 
trical accumulation upon A, consist of the polarity which it indu- 
ces in B? £ esti oa 
Having supposed (viii,) an electrified ball, A, an inch in diam- 
eter, to be situated within a thin metallic sphere, C, of a foot 
in diameter, you suggest that were one thousand concentric me- 
tallic spheres interposed between A, and the inner surface of C, 
the electropolar state of each particle in those spheres would be 
analogous to that of B already mentioned. Of course if there be 
an action of those particles, there must be an action of B; but 
this appears to me not only irreconcilable with any previously 
existing theory, but also with your own exposition of the process 
_» by which B is polarized. rm us 
7 Supposing concentric metallic hemispheres were interposed 
only upon one side of A, you aver that agreeably to your experi- 
ence, more of the inductive influence would be extended towards. 
that side of the containing shell than before, (xiv. ) Admitting ~ 
this, I cannot concede that the greater influence of the induction, 
_ resulting from the presence of the metallic particles, is the conse- 
quence of any action of theirs; whether in contiguity or in proz- 
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