858 
also still positive on account of the small value of V — v in regard 
to C. We will, therefore, in future always put A’ positive; should 
it become negative the necessary alterations can readily be introduced. 
We now distinguish two cases. 
a. V >v, dT and dà have the same sign; 
hb. V<v, dT and dà have the opposite sign. 
Now, it follows from (15) that dà > 0 signifies that one is moving 
from point /’ towards the vapour phase. From this we conclude: 
The part of a saturation line passing through the point / of the 
substance /’ under its own vapour pressure and situated in the 
vicinity of / moves at an increase of temperature: 
a. if V > wv, towards the vapour phase appertaining to point #. 
b. als V <v, away from the vapour phase appertaining to point £ 
From (6) and (7) instead of (16) we can deduce also: 
kK dP= (En) (7, —a)’ HOE 2 (w,—@) (Y, =P) 8 an (y,—8)’ ú dd. (17) 
From this we conclude: 
The part of a boiling point line of the saturated solutions of F 
situated in the vicinity of / moves, on increase of pressure, always 
more towards the vapour phase appertaining to point £. 
In order to get a better knowledge of the saturation line of F 
under its own vapour pressure which passes through the point £ 
and of the boiling point line of the saturated solutions of #’ we will 
also introduce in our formulae terms with dz*, dz dy, and dy’. In 
order to simplify the calculations a little we will assume provisionally 
that the vapour consists of one component only. 
We, therefore call in our previous formulae 2, =O and y, = 0. 
Our equilibrium conditions (1) then are converted into: 
0Z A 
4 A Se ee 
PT 1 (18) 
ay Z 
Pr REE EEn 
Oa: Oy 
We now write for (18), 7’ being kept constant : 
i: Or Os 
(ar +-ys)de + (ws-tyt) dy + — (- dte ) de + = 
2 Ow Ow 
Neen 
: («+05 dr) de do zl $05 huge) a ts 
OV OV 
a fl 4 ve Ly bP Wisin NGO PG EN 
( dw ds 
From (19) follows: 
