WITH MAGNETISM AND ELECTRICITY. Wj 



ence on the increase or diminution of the magnetizing force ; and 

 by the connexion of electro-dynamics and magnetism developed 

 by Ampere for the third case, the ideal distribution is, in its 

 turn, given in its dependence upon the molecular flux. We thus 

 obtain, mediately, the connexion between the ideal distribution 

 and the increase or diminution of the magnetizing force to which 

 it corresponds. 



But it is evident from the above, that at every moment when 

 an increase or diminution of the magnetizing force takes place, 

 such a molecular flux must be generated, and that these currents 

 thus successively excited, if they do not of themselves again 

 disappear, must sum themselves up. These currents however 

 do not vanish of themselves, for Ampere has proved that per^ 

 sistency must be ascribed to molecular currents; that is, the 

 electric fluids, in their circular motions around the ponderable 

 molecules, suffer no such resistance as that encountered when the 

 fluids traverse a ponderable conductor, to which resistance is to 

 be attributed the speedy disappearance of the electric currents 

 in these conductors. [From this persistency, which belongs of 

 necessity to the molecular currents, it is manifest that the possi- 

 bility of throwing the electric fluids into molecular currents is 

 to be referred to the fact, that in the molecules, or around them, 

 closed paths exist in which the said fluids move without resist- 

 ance.] From this it follows, that a continuous increase of the 

 magnetizing force is accompanied by a continuous accumulation 

 of the magnetic fluids, according to the ideal distribution ; and 

 hence we infer that every given strength of the magnetizing force 

 has a definite moment of ideal distribution corresponding to it. 

 This summation however takes place only in the case of molecular 

 currents, for in this case alone the electric fluids move without 

 resistance. Other currents, which are excited by the same force 

 at a greater distance, but which, on account of the resistance 

 experienced, quickly disappear, produce magnetic effects on 

 other bodies only during the moment of their excitation (through 

 increased or diminished magnetizing force). These effects imme- 

 diately vanish as soon as the force has become constant, and 

 hence stand in no relation whatever to the magnitude of the 

 existing magnetizing force ; a relation however must exist if the 

 actions of variable magnets and diamagnets are to be accounted 



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