M. Berthier on the Mag?ietic Action of Mangayiese. Q5 



state of oxidation or not. But it must be remembered that 

 the moment a particle of silver is reduced on the iron, it not 

 only tends to keep the iron in the peculiar state according to 

 the facts before described, but also acts as the negative elec- 

 trode, and there is no doubt that the current of electricity 

 which continues to circulate through the solution passes es- 

 sentially between it and the silver, and not between it and the 

 iron, the latter metal being merely the conductor interposed 

 between the silver and the copper extremities of the metallic 

 arrangement. 



I am afraid you will think I have pursued this matter to a 

 greater length than it deserves; but I have been exceedingly 

 interested by M. Schoenbein's researches, and cannot help 

 thinking that the peculiar condition of iron which he has 

 pointed out will (whatever it may depend upon) enable us 

 hereafter more closely to examine the surface-action of the 

 metals and electrolytes when they are associated in voltaic 

 combinations, and so give us a just knowledge of the nature 

 of the two modes of action by which particles under the in- 

 fluence of the same power can produce either local effects of 

 combination or current affinity *. 



I am, my dear Phillips, very truly yours, 

 Royal Institution, June 16, 1836. M. Faraday. 



XIII. Notice of the Magnetic Action of Manganese at Lonso 

 Temperatures^ asstated by M. Berthier. In a letter from 

 Mr. Faraday. 



To the Editors of the Philosophical Magazine and Journal. 

 Gentlemen, 

 nPHE following fact, stated by M. Berthiei-, has great interest 

 -*- to me, in consequence of the views I have taken of the 

 general magnetic relations and characters of the metals. As 

 you have done me the favour to publish these views in your 

 Magazine f, perhaps you will think the present note also 

 worth a place in the next Number. 



Berthier in his Traite des Essais par la Voie Seche, tome i. 

 p. 532, has the following passage in his account of the physical 

 properties of the metals. " Magnetism. — There are only 

 three metals which are habitually endowed with magnetic 

 force : these are iron, cobalt, and nickel ; hut manganese also 

 possesses it beneath a certain degree of tempo-atiire much below 

 zero." There is no reference to any account of this experi- 



• Experimental Researches, Eighth Series, parr. 947. 996. [or Lond. and 

 Edinb. Phil. Mag., vol. vi. pp. 174, .3.37.— Edit.] 



+ See Lond. and Edinb. Piiil. Mag., vol. viii. p. 177. — Edit. 

 Third Series. Vol.9. No. 51. July ISSG. I 



