Second Letter from Dr. Hare to Prof, Faraday. 3 



epithet to convey the idea which I have of the state of a mass 

 thus electrified, I would designate it as an electropolar state, or 

 as a state of electropolarity. 



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, '^Fhe 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 takes place, to be put into the state of the body B, it 

 does not appear to me to justify your definition of electrical induc- 

 tion. I conceive 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 ? 



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. 



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 prox- 



