( 12 ? ) 
The minimum value of ^ is = 0,33. The horizontal point of inflection 
I = C y D lies evidently in the neighbourhood of <p = 2,5, v = l,07, 
p = - 750. 
At 200° not a trace is left of the horizontal point of inflection, 
and only the minimum E and the maximum B of the ordinary 
isotherm of van der Waals is to be seen, as will appear from a 
following table. 
11. We shall, however, first give a survey of the situation of the 
maximum D and the minimum C at the different temperatures from 
T= 0 to T— 160 calculated by us. 
7=0 
9 
100 
128 
144 
160 
00 
173 
9,5 
5,9 _ 
4,4 
2,5 
1 <Pc 
00 
8 
1,8 
1,8 
1,8 
lft> 
0 
0,027 
0,27 
0,37 
0,45 
0,43 
0 
1,77.10-37 
0,014 
0,096 
0,20 
0,99 
0,93 
0,93 
0,94 
1,07 
( v c 
1 
1,06 
1,28 
1,26 
1,24 
j P» 
+ 3700 
+• 3470 
+ 690 
— 120 
— 500 
— 750 
1 Pc 
— 2700 
— 2100 
- 940 
— 770 
— 730 
As was said before, the locus of maxima and minima (one con¬ 
tinuous curve, on which the point of inflection is also found; is 
indicated by a dotted line on the plate. 
If we wish to know the data of the point of inflection accurately, 
we may calculate them from the formulae which I drew up in the 
before cited paper in the Arch. Teyler for a critical point (i. e. for 
every point where a maximum and a minimum in the isotherm 
P = f {v) coincide, to a horizontal point of inflection), viz. (see loc. 
cit. p. 29 and 31): 
27M+P 
in which m and n have the following signification: 
m=i + 7. 0(1-0) (!-*>)’ 
* = 1 + 7« (1-*) + V. fll-fl) (1-3/**) (1- 
• ( 15 ) 
