612 ADDITIONS. 



that it requires to be made much more precise before we can say 

 what consequences it does or does not lead to. Professor W. Thomson 

 has arrived at a mathematical proof that the effect of induction on the 

 view of Coulomb and of Faraday must, under certain conditions, be 

 necessarily and universally the same. 



With regard to the influence of different Dielectrics upon Induction, 

 the inquiry appears to be of the highest importance ; and may cer- 

 tainly necessitate some addition to the theory. 



