( 41G ) 



The empirical formula was applied to these mean results. 



C\ = 0,2Ul 



C\ — 0,6663 



Maguet. field. 



2000 

 3000 

 4000 

 5000 

 0000 



Percentage increase 

 observed. calculated. 



1,84 

 3,55 

 5,52 

 7,63 

 10,00 



1,81 

 3,52 

 5,51 



7.07 

 9,98 



Difference. 



—0,03 

 —0,03 

 —0,01 

 +0,04 

 —0,02 



As we see, the agreement is very satisfactory. The coefficient Ci 

 is almost the same as for the increase of the resistance, whence we 

 conclude: — the tioo phenomena differ in different magnetic fields only 

 by an almost constant factor ^). 



h. Results of other observers. 



It appears that the observations of von Ettingshausen and 

 Nebnst cannot be represented by our formula. Therefore I shall 

 only recalculate their results for the longitudinal effect and compare 

 them with the increase of resistance in their bismuth. 



1) In my thesis for tlie doctorate (p. Ill — 114) I iwinted out tliat the phenomena 

 mentioned might have a common cause in a variation of the number of free charged 

 particles due to the magnetic field. The found proportionality renders a common 

 cause very probable. 



