429 
AMAGAT’S observations covering the region 0° tot 200° C. were taken 
from Comm. No. 71, p. 148. From the observations of BESTELMEYER 
and VALENTINER *) it is possible to obtain still another value for By. 
At T=51,01 we get Barr = — 3,411.10-8, from which with (2) By 
follows. 
py Comparison of the nitrogen dia- 
; gram with the curve for constant 
doublets and with the hydrogen 
diagram shows that nitrogen devia- 
tes markedly from the other two 
especially in the neighbourhood of 
the Boyrr-point *). Comparison with 
the curve for aw and dw constant 
shows that the four points taken 
from AwaGaT’s observations can be 
brought into pretty close agreement 
with the curve, while the point given 
by BesSTELMEYER and VALENTINER lies 
then pretty far above it (see Fig. 5). 
In Fig. 5 the point 
log r= 0,004, 4, = 9,731—10 
coincides with the point 
lox fT == 2,5, log. By = 7,05, 
3° Mikrazen 
— At B const 
\ 
\ 
Ee 
ee 
oe from which we get, for the region 
21 994° covered by Amacat’s observations : 
93 IE 2 44 10-2 Be = OR 
Fig. 5. 
$ 6. Coefficient of viscosity *). It seemed of importance to inves- 
tigate whether the results obtained in § 3 find confirmation or not 
in the manner in which the coefficient of viscosity varies with the 
temperature. The second column of the following Table, which, on 
it appeared not quite devoid of interest to utilise the data at present available 
for these two gases subject to such reserve as may be necessitated by future 
control and extension, for comparing with the results of Suppl. N°. 24, 
1) A. BESTELMEYER and S. VALENTINER. Ann. d. Phys. (4) 15 (1904), p. 72. 
2) The different behaviours of N, and O; from the point of view of the law of 
corresponding states was illustrated by the two corresponding Tables of Comm. 
No. 71. The influence of the magnetic properties of oxygen will be investigated later. 
3) An investigation of viscosity at low temperatures has been in progress at 
Leiden for some time, Papers by KAMERLINGH ONNES and DoRSMAN on the viscosity 
of hydrogen and by KAMERLINGH ONNES and S. WeBER on helium will soon be 
published. 
