Magnetic Characters of Metals^ ^c. 93 



of completely neutralizing the magnetic actions of other 

 bodies. 



68. The Mono-magnetics at present known are but few in 

 number, iron being the grand type. Next to iron is nickel. 

 Cobalt is also a mono-magnetic body, and, at present, com- 

 pletes the list of this class of magnetics. 



69. In the Suno-magnetic class I place alloys of copper and 

 silver, copper and gold, and copper and zinc ; and although 

 these three are the only ones with which we are acquainted, 

 I have no doubt that many more alloys will soon find a place 

 among suno-magnetics. 



70. The Kato-magnetics are very numerous, as this class 

 includes all bodies which, by combination, impair the mag- 

 netism of other bodies. Amongst the metallic Kato-mag- 

 neticSi zinc is the most powerful hitherto ascertained. Next 

 to zinc is antimony. Then lead and tin. Arsenic, probably, 

 stands very high in this class, but I have had no opportunity 

 of ascertaining its proper place. The non-metallic Kato-mag- 

 netics are sulphur, oxygen, cyanogen, chlorine, carbon, and 

 the generality of those bodies which combine with the metals. 



71. In proposing this classification of magnetics, I have 

 aimed at nothing further than an abstract of that which ab- 

 solutely takes place in nature. The whole rests upon facts, 

 most of which have their analogies in electricity. All bodies 

 are known to possess electric properties, but differing in de- 

 grees of power, and the compounds display very different 

 electric powers to those of the simple constituents. The 

 electro-magnetic powers difi*er in different bodies, both simple 

 and compound, as decidedly as the powers which are purely 

 electric. Therefore, this classification may be considered as 

 supplying a small portion of an extensive nomenclature that 

 has long been wanting in this region of science. 



