1061 
the zero-point pressure was 1000 mm. and the temperatures were 
calculated using .0036614 as the pressure-coefficient. For the calcu- 
lation of the temperatures we may refer to a previous communication *). 
3. Results. 
The results of our observations are contained in the following table : 
T 9 Pooax (intern. atm.) erat Me | 
43°,83K | —229°.26C 24.305 670 
449.43 | —228°.66 26.049 | 416 
Above fx the following point was established : 
| £ p (intern. atm.) 
449,94 K 
| 
Sad 
| —228°.15 C | 27.462 
From these data we have derived: 
| “Critical constants | 
Tj Ao | Pr 
RR 
449,14 K | —228°,35 El 26.86 
| 
a 
| 
We are glad to record our thanks to Mr. J. M. Bereers phil. 
cand., assistant in the Physical Laboratory, for his assistance in 
checking the automatic temperature-regulation during the experiments 
by means of the resistance-thermometer {2 and the thermometers 
0, and 4, (ef. fig. 1 of the previous communication). 
4, Discussion. 
In a previous communication’) two of us had drawn some 
preliminary conclusions as to the critical temperature of neon from 
1) H. KAMERLINGH Onnes and G. Horst, Proc. XVII, 1, p. 501. Comm. N°. 1414. 
2) H. KAMERLINGH ONNES and C, A. Cromme in, Proc. XVIII, p. 515. Comm, 
N°. 147d. 
