CITAXGE OF VOLUME AND OF LENGTH. /Ö 



nnd /." are physically functions of the strain, as is l)Orne out by 

 the numerous experiments on the effect of stress on magnetization. 

 The present state of the theory of magnetostriction may perhaps 

 be compared witli that stage in the history of the theory of 

 magnetization when the intensity of magnetization was supposed 

 to be simply proportional to the magnetizing force. In fact, the 

 theoi'y is still in its infancy, so that there are ample grounds 

 for expec!ing further developments on further researches. 



