320 H. XAGAOKA 



able to turn beyond a certain angle, so that when once the sudden 

 rotation of molecules takes place, the rate of turning becomes very 

 small. It also appears that when the sudden turning of the molecules 

 takes place, the tendency of the molecules to revert to their former 

 positions is very small, the retentiveness being large 



All this is a mere hypothesis, since we know nothing of the 

 original arrangement of the molecules, and far less of how they are 

 changed. If however we assume Weber's theory, we may regard the 

 curious phenomena presented by twisted nickel as being accompanied 

 by such motions of the magnetic molecules as have just been described. 



