WIEDEMANN EFFECT IN FEEROMAGNEÏIC SUBSTANCES. 17 



the comparison of the above results in iron and nickel bars 1cm thick, 

 obtained by varying- the longitudinal field, with the corresponding 

 results in wires of these metals about Iiidii thick, shows the correctness 

 of the law of the inverse square of the radius. 



In conclusion, we wish to express our best thanks to Professor 

 H. Xagaoka for useful suggestions in the course of the present 

 experiment. 



