176 WEBER ON THE CONNEXION OF DIAMAGNETISM 



for the diamagnetic moment, where the reciprocal actions of the 

 molecules were disregarded. Setting 



m 



where m denotes the mass and p the density of the body, we 

 obtain for the diamagnetic moment the expression 



. mX, 



P 

 instead of the expression found above, 



~" 7; — • A^^6 • ^X. 

 dcc€ 



In both methods the diamagnetic moment is represented as the 



product of the mass m into the magnetizing force X, multiplied 



with a constant coefficient, which in the last expre sion con- 



sists of two factors, namely, the factor r — , to be taken from the 



oCC€ 



general theory of electricity, and the factor fir^e dependent on 

 the nature of the diamagnetic body ; this has been already named 

 the diamagnetic constant of the body. These two factors are 



not separated in - ; -, indeed, is nothing else than the product 



of the above two factors. 



The quantity /c is here assumed as constant (that is, indepen- 

 dent of the strength of the magnetizing force X), because Neu- 

 mann has proved from the theory of separable magnetic fluids 

 that it must be constant (that is, independent of the strength of 

 the separating force X). The results above stated are, however, 

 independent of this assumption, and retain their validity even 

 should closer examination prove /c to be a function of the mag- 

 netizing force X. From this examination, however, it will fol- 

 low of itself, that even if k changes with X, h will nevertheless 

 possess a constant value for every diamagnetic body. 



By the theory of diamagnetism here developed, it is easy to 

 show that the disputed question, whether magnetic fluids actually 

 exist, can be decided. 



On the Existence of Magnetic Fluids. 

 When a certain class of actions of one body upon other 

 bodies is so characterized that these actions may be explained 



