646 
hydrogen below the Boyre-point, then it follows from fig. dk BN 
ihe attraction potential for argon is also proportional to —r *; but 
this conelusion must always be subject to reserve concerning the 
validity of the assumption just made down to the lowest temperatures, 
which has not yet been submitted to the test of experiment in the 
present case. 
c. Following $ 6 of Suppl. N°. 25, the accompanying table gives 
the temperature variation of 1» (7 is the coefficient of viscosity) 
as given by the measurements of Kopsca*) compared with values 
of by! from 
1 4 
bw = me, LNE NT eee (2) 
vw 
_ 
The latter relation appears on the separation of the attraction virial 
from the collision virial, as is indicated in equation (41) of Suppl. 
N°. 244. For v the value 1.46.10-'4 is taken from the data given 
on p. 645 note 1 for the superposition of the diagram for H,, A 
upon that for the attraction potential — #7 with ¢= 4 (for the 
relative positions of the H, and the A diagrams see p. 425 note 3 
of Suppl. N°. 25). 
| —— bwooc 
yf Tooc DE 
PRS ore 
NooC attraction 
potential —r—4 | 
| ats v= 1.46. 10-14 
0 1.000 1.900 
— 40.17 0.949 0.927 
— 78.82 0.883 0.836 
| 
— 132.30 | 0.729 0.660 
— 183.17 | 0.606 0.406 
corresponding value for the index of 7 in the law of distance governing the force. 
From the ratio of the potential (heat of exparsion) to the virial, REINGANUM, Ann. 
d. Phys. (4) 6 (1901), p. 546, deduces that the force is proportional to from 
font: 
1) The deviations of the individual values of BN from q =d are of the same 
order of magnitude and are throughout in the same sense as their deviation from 
the values adjusted according to the empirical temperature polynomial. 
2) W. Kopscu. Diss. Halle 1909. 
