WITH MAGNETISM AND ELECTRICITY. 199 



According to the same formulae, we obtain for the iron bar 

 with which, by a comparison of the magnetic actions, m was found 

 to be 1470000 times greater than its value for bismuth, X being 

 = 629-9, 



m=2134; 

 hence for bismuth, where 



For the iron bar, on the contrary, with w^hich, by a comparison 

 of the inductive actions, m was found to be 360740 greater than 

 for bismuth, X being =3012, we have 



m =2305-4; 

 hence for bismuth, where 



V csr..^ 2305-4 1 



^=^«^2'» =360740=156^- 



According to this it appears that when the magnetizing force is 

 increased 4*8 times, the diamagnetism of the bismuth increases 

 4*4 times ; that is, nearly 'proportional, although one determina- 

 tion is founded on a comparison of the magnetic actions, the 

 other upon a comparison of the inductive actions. We thus 

 find the proposition confirmed, that the relation of the inductive 

 actions to the magnetic ones is the same in the case of diamag^ 

 netic bismuth as in that of magnetic iron. Reducing diamagnet- 

 ism to the same absolute unit as magnetism, we obtain finally 

 the strength of the diamagnetism of 1 milligrm, of bismuth, 

 operated upon by the magnetizing force X = 1, 



452000' 



and the strength of the magnetism of 1 milligrm, of iron, under 

 the influence of the magnetizing force X=l, 



= 5-6074, 



that is, the magnetism of a thin bar of iron exceeds the diamag- 

 netism of an equal mass of bismuth, when small and equal mag- 

 netizing forces operate upon both, about 2| million times. For 

 thicker bars and greater magnetizing forces this number is 

 found to be somewhat smaller, 



[J.T.] 



