( 147) 
§ 7. Finally a similar calculation to that used for form IV was 
carried out with polynomials 
1 1 
Hb t-1 by + by om fa 
8 
C= t+ Co + Cs ; at oer 
Ee 5 4 1 1 
=), f+ ROME rea ais ; . cv 
2 1 
ee tae ee) eg es 
te 
FE i pet 1 | 
S=fittht+f ths | 
It gives for the required values 
Temperature coefficients of the reduced virialcoefficients. 
| 1 | 2 | 3 | 4 
1086) | + 183.212 | — 405.612 | — 127.258 | — 122.435 
10% CW | + 67.880 | — 62.647 | + 131.275 | + 97.214 
1018) | + 474.472 | — 306.627 | — 657.471 | + 126.64 
102 eV) — 1871.27 | + 6426.11 | — 4651.33 | + 781.52 
ee pe + 2002.92 | — 7272.08 | + 6331.42 | — 1170.45 | 
Although I thought at first that a good representation of the obser- 
vations could best be attained by IV, it appeared that the represen- 
tation by means of the more simple form V almost entirely cor- 
responds to this. The reduced virial coefficients calculated according 
to V correspond so closely to those calculated according to IV that 
it was entirely superfluous to separately calculate another equation 
for all observations by means of this form (V) as was done for IV 
(again using the reduction factors in § 4 in order to find the virial 
coefficients in the development in series II). 
