( 307 ) 
wer GGO. 
Eee ae) RTS | MRT: (MRT)? 
dv? Jp 
(aon) WEN 3% 1 
EE) (anny! ae), + ART ri)! 
If once more as in $ 2 we introduce the law of corresponding 
states, this form may be reduced to: 
De a 
Cy ve dx 0 ($3 ).c,( 22) 
x |. eS 5e) | ee 5 (=) 
— o(55-)\p —« (=) 80e). ss (26) 
dvs 
dx 
In this formula two new constants occur, to be derived from the 
equation of state, viz. 
8/037 dn 
C (sa =) and @ = ap) 
According to VAN DER WAALS’ formula with ae “* for the 
molecular attraction (as well as for CLAUSIUS' formula) at the critical 
point 
2 0° 0°70 
O(a ==) eee! ole) =— 
In consequence of the results found during the testing of the 
formulae (2a) and (2b) it is obvious that the observations do not yield 
sufficient data to test formula (2e), the more as higher differential 
quotients of 7r occur. For the comparison of observation and calculation 
formula (3) is for the present the most important. 
4 1 
where for a—/? we may write: — 
Uk 
TT 
