874 
We have seen above that the sign of (AV )z, (AM)z and (AA), 
depends on the value of 4, consequently of the position of the point 
m in fig. 1. In proportion as viz. the point m is situated more 
closely to the line AZ,, y becomes smaller; when mm is situated on 
AZ, then y — 0. 
L First we consider the case that the point m is situated not 
too closely to the line AZ,. Then we have: 
(AV)u , (AV)z and (AV), >0; (AVjz<0 ;-AVjeZz0 
VEL Nr (AH)z 3 (AH)¢ ; (A, and (AA)y > 0. 
It follows from 5, when we omit the reaction coefficients, for 
the isovolumetrical reaction that: 
MAAHG2Z44L OS A etl 
(Z) (L) (Zo) (A) 
Towards lower 7’ Towards higher 7. ’ 
As (AV); may be as well positive as negative, we give in this 
reaction to the phase G as well the sign + as — 
It follows from this reaction that the curves (7) and (L) go 
towards lower temperatures starting from the invariant point m and 
the curves (Z,) and (A) towards higher temperatures. As the phase 
G may have as well the positive as the negative sign, the direction 
of curve (G@) is undefined; it may go, starting from the invariant 
point as well towards higher as towards lower 7 
When we omit the coefficients in the isentropical reaction, then 
follows from 6: | 
Zed AL AVja<0 ; 0 
(Z) (L) (Zp) (A) (G) 
Towards lower P | Towards higher P. 
Hence it appears that the curves (Z) and (Zj) go towards lower 
pressures, starting from the invariant point and the curves (7%,), 
(cl) and (G) go towards higher pressures. 
It is apparent from both these reactions that the curves must be 
situated as in fig. 2 as regards their direction of pressure and tem- 
perature. The curves (7) and (Z) must go viz. starting from mm 
towards lower P and 7, the curves (Z,) and (A) towards higher 
P and 7. Curve (G) must go towards higher P, starting from m, 
but it may go as well towards lower as towards higher 7. 
Now we have still to determine the position of the curves with 
respect to one another. We have viz. still to show that in fig. 2 
curve (Z,) is situated below curve (A) and above the metastable 
prolongation of curve (7), ete. 
