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Physics. -- "On tlie electrical residance of pure metals etc. IX. 

 The resistance of mercury, tin, cadmium, constantin, and 

 iiiancjanin down to temperatures, obtainahie with liquid hydrogen 

 and fvith liquid helium at its hoiUmj point.'' By Prof. H. 

 Kameklingh Onnes and G. Holst. Coimn. N". i^2a from tlie 

 physical Laboratory at Leiden. (Communicated by Prof. H. 

 Kamerlingh Onne8). 



(Communicated in the meeling of June 27, 1914). 



§ 1. The resistance of luires of solid mercury. 

 Several mercury resistances wei-e compared with tiie phitinum 

 resistance thermometer Pti of the laboratory, first in liquid oxygen, 



