MICHAEL FARADAY 197 



electricity it is evolved entirely within the substance of metals retain- 

 ing all their conducting power. But an agent which is conducted 

 along the metallic wires in the manner described ; which, whilst so 

 passing possesses the peculiar magnetic actions and force of a cur- 

 rent of electricity ; which can agitate and convulse the Hmbs of a frog ; 

 and which, finally, can produce a spark by its discharge through char- 

 coal (32), can only be electricity. As all the effects can be produced 

 by ferruginous electro-magnets (34), there is no doubt that arrange- 

 ments like the magnets of Professors Moll, Henry, Ten Eyke, and 

 others, in which as many as two thousand pounds have been lifted, 

 may be used for these experiments ; in which case not only a brighter 

 spark may be obtained, but wires also ignited, and, as the current can 

 pass liquids (2^), chemical action be produced. These effects are 

 still more likely to be obtained when the magneto-electric arrangements 

 to be explained in the fourth section are excited by the powers of such 

 apparatus. 



58. The similarity of action, almost amounting to identity, between 

 common magnets and either electro-magnets or volta-electric currents, 

 is strikingly in accordance with and confirmatory of M. Ampere's 

 theory, and furnishes powerful reasons for believing that the action is 

 the same in both cases ; but, as a distinction in language is still neces- 

 sary, I propose to call the agency thus exerted by ordinary magnets, 

 magneto-electric or magnelectric induction (26). 



59. The only difference which powerfully strikes the attention as 

 existing between volta-electric and magneto-electric induction, is the 

 suddenness of the former, and the sensible time required by the lat- 

 ter: but even in this early state of investigation there are circum- 

 stances which seem to indicate, that upon further inquiry this differ- 

 ence will, as a philosophical distinction, disappear (68). 



