(122%; ) 
b b,\n 
q : ' : ae * 
1—a =) is to be considered only as an empirical formula, 
q Uv 
holding by approximation in the neighbourhood of vz. 
Now, however, it remains to investigate in how far the existence 
of Quasi association has influence on the obtained results. 
In general: 
dp dp + dp de 
dT dT de ),p\ dT), 
n ein equa O in CE ote ( r : 
7 , 2 U AT ) riuica point, also 
r 
x 
d | d da 
T—= fs -|- ii pees 
Ge v- b da Jor aL J; 
meee) 
we 
ee SS ye 
Tet aia ING Te) 
Now we have chosen the quantity ” so, that: 
or 
dp a 
or in such a way that: 
Ge (7S). POLS ot 
v? daz) yl dT 
da 
Now the value of (F 
=), is necessarily negative, and so the value 
( 
dp 
of Ge will also be negative for the chosen value of 7. 
U/cT 
Though the w-surface has minimum value of 7% for a definite 
value of w, a section at given value of v will not begin with increase 
of p, as is usually the case; but will always show decreasing value 
dx 
of p. The value of (7 =) we must determine by differentiation of 
v 
dp 
— \=0O and so from the equation: 
da vr 
dp dp dp 
d la dl} 
(= Pa de (ze ) ae v (5 77): 
or 
