431 
the viscosity of hydrogen at — 192°.7C. and that of argon at 0°C. 
deviate from correspondence by only 6°/, (taking the coefficients of 
similarity from $ 3 d), but that the viscosity of hydrogen from — 198° C. 
upwards increases much more slowly with the temperature (corre- 
sponding to a more rapid increase in the attraction in the case of 
hydrogen within the region of transition) than corresponds to the 
increase in the viscosity of argon. This confirms in some degree the 
conclusions reached in $ 3. 
Contirmation would have been attained in a higher degree if 
corresponding to § 4 agreement had been obtained between the 
temperature variation of the viscosity of oxygen and bw oec./bw as 
given by (8), using the value of v obtained in § 4. This, however, 
is not at all the case. That temperature variation can, indeed, as 
far as observations’) go, be represented with the aid of by! of 
(8) but then we find v— 2,79. 10—" instead of the 7,71 .10—'4 
deduced in $4 from the coefficient B. Unless the agreement obtained 
in § 4 is wholly fortuitous we must conclude from this that a 
deviation from the temperature variation of the viscosity of oxygen 
as deduced upon the assumption of rigid spheres each with a constant 
doublet at its centre is occasioned by some circumstance whose 
influence upon / vanishes, or is at least extremely small. As such, 
for instance, one could regard deviations from sphericity in the 
molecular shape. 
1) By H. MARKOWSsKI. p. 430, note 1. (The observations by E. Vörker, Diss. 
Halle 1910, on the coefficient of viscosity of O; down to — 152°.52 C., which 
came to my notice only after the Dutch original of this paper was printed, join 
those observations at 0’—14°.65 C. Below O° CG. they show a deviation from bw 
for constant doublets in the same sense as that exhibited by Hy. At — 40° CG, 
this deviation is already distinct and it finally becomes very marked. (Added in the 
English translation). 
Rely he ATA. 
In the Proceedings of the meeting of June 29, 1912. 
p. 258 l. 9 from the top: for micro-complexion read macro-com- 
plexion, 
p. 2611. 1 ,, ~~ ,, bottom: for uw», — A {t¢(r,)} read h {u.,—4¢(r,)}. 
Pp. 206 letD 4, » top: for o read r. 
ee OM Ss i ieee , bottom: for HBD read EBB’. 
(October 24, 1912). 
