312 it. HONDA : ON THE MUTUAL INFLUENCE 



order of application of the two perpendicular fields. This was 

 verified experimentally for each tube. 



The magnetic reolotropy also causes the direction of 

 the resultant field to differ from that of the corresponding 

 magnetization ; but as Avill be seen from the present experiment, 

 the effect is very small. 



In strong longitudinal fields, the demagnetizing force dimi- 

 nishes with increasing transverse field, and therefore the effective 

 part of the field increases, so that the intensity of longitudinal 

 magnetization becomes greater than if the longitudinal field were 

 constant. This influence can also be traced in the preceding 

 table. 



The transverse field also appears to produce molecular dis- 

 turbance, and tends to increase the magnetization. It is generally 

 very small in comparison with other effects. 



Thus we have three principal causes of the discrepancy 

 between theory and experiment, i.e., the magnetic œolotropy, 

 the residual magnetism and the change of the demagnetizing force. 



G. Wiedemann'^ explained the large increase of magnetiza- 

 tion, when the transverse field is removed, by the instability of 

 molecular magnets caused by releasing the transverse field. The 

 increase is also explained by residual magnetism ; if we subject 

 the ferromagnetics to a gradually increasing transverse field, while 

 the longitudinal field is kept constant, it will be strongly magne- 

 tized, and therefore when the transverse field is gradually or 

 suddenly removed, there must remain a large amount of resid- 

 ual magnetism and hence we observe a large increase of magneti- 

 zation. That the increase becomes greater as the longitudinal 

 field diminishes, amounting sometimes to double its initial value, 



1) loc. cit. 



