( 306 ) 
Hence 
dv MRT cp" MRT MRT + q' 
©),- a ae 
U/ pT op 
seed hes OC : 
a (1—z) (2) Gok H ae GE 
+ terms with x in the denominator. 
In a similar way we develop each of the differential quotients 
in (5), always retaining the terms of the highest order but one. 
We shall not repeat here the rather lengthy computations; it must 
be remarked that in the reduction of the differential quotients ot 
n we have started from the fundamental form 
so Ga (=) fe 
re 
We obtain 
"GGD (Geet Gt 
NN: 
). (ae) GE 
| On 
In the same way En i determined by means of «. 
hy : / 
(=) is expressed by means of differential quotients of yw, where 
3 
02u dv 8 9% i 
among others (5,2), and Ga), Ge The equation Ge) = 
2 3 
gives a value for =) after which Ge can be determined from 
dw pT dz? pT 
the equations obtained by differentiating 
p=f(ee 7) 
three times with regard to «, keeping 7 and p constant. 
All this performed, we finally obtain: 
') Comp. vAN DER Waars, Continuität II pag. 125. 
