449 



The results of the measurements are contained in taUle II : 



The first column contains the temperature as determined by means 

 of a calibrated Pt. -thermometer. The second and third give the 

 results of the measurements with the two tubes expressed in baryes, 

 the fourth and fifth the same numbers after correcting for the 

 thermal molecular pressure. For the measurements between — 150° 

 and — 162° these corrections are somewhat uncertain, as they have 

 been determined experimentally for hydrogen and oxygen only. 

 Moreover the tubes had not been chosen as favourable as possible, 

 as will be clear from the followipg. 



29 



Proceedings Royal Acad. Amsterdam. Vol. XVI. 



