Physics. — "Isothervials oj moii,-<ttoinic substances and their binary 

 mixtures. XIX. Vapour- pressures of neon beticeen the boiling 

 point and the critical point" . By P. G. Oath and H. Kamerlingh 

 Onnes. Communication N". \b2b from the Physical Laboratory 

 at Leiden. 



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



Using the same apparatus and the same method as described in 

 Comm. N". 152^ (previous communication) we have determined 

 vapour-pressures foi' neon between the boiling point and critical 

 point. The pressures below 20 atmospheres were measured with the 

 open standard-gauge of the laboratory^); for pressures higher than 



') Leiden Comm. N'\ 44. These Proceedings I, p. 213. 



