( 211 ) 



Alio is the wire which was calibrated in Comm. N°. 95 d . After melting it 

 down Dr. Hoitsema found 0,03°/ impurities. As to the wires Aujjl, Amy 

 and Auy, Dr. Hoitsema found about 0.015% admixture for Aum, 

 about 0.005 % admixture for Aiiiy and Auy. AuA g \ was made of an 

 alloy which after the wire had been remelted, contained 0.4 °/ 

 admixture (probably chiefly silver). Wound round the same glass 

 cylinder all wires except Au and Aua \ were heated at the same 

 time in an annealing furnace for a long time, and slowly cooled, as had 

 also been done with Au and AuAg\, so that they were perfectly 

 malleable. 



In table I the resistances have been given expressed in that at 

 0° as unity. These were about 9S. 



To facilitate comparison we may observe that Dewar found 

 0.03290, whereas we found 0.008103 at — 252°.93 for Au v . 



§ 3. Mercury. It -was doubly distilled and brought into a glass 

 spiral. The latter was protected by a bath of pentane, which was 

 slowly cooled from the bottom upwards before it was immersed into 

 the bath of the cryostat. We found : 



