66 ART. T.— K. HONDA. AND T. TERADA. 



theory and experiment rather worse. The origin of this term 

 is, however, to be traced to the fundamental assumption that 

 at the ends of the specimen wire, the lines of induction issue 

 normalh'^ from its end faces — an assumj)tion far from being 

 realized in our actual experiments. Hence the importance of this 

 term must be reduced, when applied to the case usually subject 

 to exjDeriments. 



Thus far, the agreement between theory and experiment is 

 in general to be considered as fairly good, if we consider the 

 difficulties encouutei'ed in measuring the minute strains caused by 

 magnetization, and also the considerable dependence of the mag- 

 netization ujDon the order of magnetizing and straining. Since 

 the theories, which are based upon quite different considerations, 

 all agree with one another in the first important term, it may be 

 concluded that for the first approximation, they are all verified 

 by the present experiment. It seems however impossible to decide 

 experimentally the correctness of the terms of second importance 

 for ferromagnetic substances, in which the hysteresis effect appears 

 in no inconsiderable amount. 



In conclusion, we wish to express our best thanks to Dr. 

 S. Sano for useful suggestions in working out the theoretical 

 part of the present investigation. 



