( 214 ) 



This column O — Ca iu gives the differences with a formula of the 

 form A (see § 4), with values which we shall indicate by Am on 

 account of the adjustment at two hydrogen temperatures and over 

 the region to 0° : 



§ 6. Lead. The knowledge of the resistance of lead is of particular 

 importance on account of the fact that this metal does not show 

 the TuoMSON-effect. Probably the lead used by us, contained no more 

 than 0,015 °/„ admixture. 



The resistance of a narrow strip cut out from the flatted lead 

 and protected against chemical action by paraffine expressed in the 

 resistance at 0° (3.18114 Q) as unity was- found to be: 



