( 1 »») 
The temperature is here already so high, that the dissociation of 
the double molecules is almost complete; even for q> = 1 the mini¬ 
mum value is still 0,9975. If £ were exactly = 1 , the isotherm of 
400° Would be the critical one (see the calculation in the previous 
paper); now it is practically identical with it. The critical pressure 
is 400, the critical volume = 1,5, i.e. just three times the volume 
of the simple molecules (= 0,5). That the critical point is just found 
at the minimum value of ft is a mere chance. For in general when 
£= 1 , i> c is = 3X2ft. On the other hand the minimum of 0 is found 
at v m = 2 (ft— ft) = ft— Bb (see before), so v c = v m , if 6ft = 2 (ft—ft), 
i.e. ft = 2 X 2ft. Now we assumed for our arbitrary substance 
bi ~ 1> 2ft = 0,5, so that this condition happens to be fulfilled. 
It appears from the table and the plate, that there the former 
minimum at E and the maximum at B have coincided in a hoiizontal 
point of inflection, i.e. in the critical point K. For temperatures 
higher than 400° this point of inflection, too, will gradually disappear. 
The different minima E and maxima B lie all on. a curve, which 
passes through the critical point K, because there the maximum and 
minimum mentioned coincide. This locus is not indicated on the 
plate (see p. 121 ) 
The following table gives a survey of the situation of these maxima 
and minima. 
In a fourth continuation the discussion of the general course of 
the p, 7 -line liquid-solid (the line SM in Fig. 4 of I) will follow. 
As to the termination point of this line at T=0 (absolute), this 
was already fully discussed in II, § 8 (p. 31—36). 
