in the Motion of the Magnetic Field, 323 



Xl+vJ- f^J^-p* ^J^~ . . . = 0, 



Jo B® a Jo 3@ ^ 



because we can neglect the terms containing p , p 3 , . . . and 

 can accept p a , p$, . . .as the independent variables under the 

 signs of integration. 



Then, on introducing significations (21), we obtain 



XI + v J + ^' aUp u + £" ffjS J^ + . . . = 0. . (23) 



Thus we have the following system of equations in case of 

 static magnetization : — Lagrange's equation (11) for the vector 

 I, which remains unchanged under the new suppositions, 

 equation (23), and the system of equations (22) : 



C Pa l*P& 



XI + v J + J ^ <r a Jdp a + I 'pSdpp 



T2 BF T2 dF 



/3 



Let us integrate the first of these equations and introduce 

 the J from it into the second term of the second equation. 

 Then, by making use of quantities a J, a ^b , . . . from the 



third equation, and by introducing all th^se quantities under 

 the signs of integration in the second equation, after denoting 

 the sum 



by *F, 



SF=^-dp +|5-d p + ..., . . .(24) 



the system of our equations will be transformed into the 

 following system : 



y(?+l)l + XJ + H = 0, . . . (25) 

 T' ™ 



TT M' 

 = /crl — k— I 



"J 





2 A2 



