Physics. — "On the measurement of very loic temperatures. X.XN\\. 

 Vapour-pressures of hydroyen in the neiyhlnnirhood of the 

 boiling point and between the boiliny point and the critical 

 temperature''. (Continued). By P. G. Cath and H. Kamkri-ingh 

 Onnes. Coininunicatioji N". 152r/ from the Pli^'sical Laboratory 

 at Leiden. 



.(Communicated in the meeting of September 29, 1917). 



§ 4. Results. The tbllowin;^- table gives a summary of the results 

 obtained. The temperatures have been reduced to the absolute scale 

 using- the t'orreetions which ai-e. deduced from the Leiden determi- 

 nation of the compressibility of helium '). Oui- thanks are due to 



1) Leiden Gomm. N''. \<M). These Proceedings. X, p. 589. 

 Procet'diiigs P>oy;il Ac;id. Amslfrdam. Vol .\X. 



80 



