1002 
M 
(MJ) (5) bay (5) 
Ö es 
/ 
/ 
pd 
(M) (Be) (MA) (avi) 
fig. 3. Fig. 4. 
The stable part of the region (/,/,41) extends itself between the 
curves (/,) and (#41). This region is indicated in the figures by 
some horizontal lines and little ares. 
In fig. 1 it extends from (£) and (#41) up to the (J/)-curve ; 
the stable part of the region (4) /,41) consists, therefore, of two 
leaves, which cover one another partly. 
In fig. 2 the stable part of the region (/, /,4:) cannot extend 
as far as the part of the (J/)-curve, which is situated in the 
vicinity of the point 4 It may be situated, as is drawn in fig. 2 
and then it has one leaf. 
I leave to the reader the deduction of the regions in the figs. 3—5. 
Now we shall consider some cases, which we can easily deduce 
from fig. 1 (VIII) and the corresponding fig. 2 (VIII). We imagine 
in fig. I (VII) the liquid Z on the line GZ,, so that L and d 
coincide. Then we have the variable singular equilibrium : 
(M)=Z,+L+4+G6G 
which is transformable. This equilibrium (J/) is represented in fig. 1 
(VIII) by the line GdZ,=GLZ,, the turning-line of the region 
Z,LG, the stable part of which is situated between the curves La 
and Lb. Now we distinguish two cases: 
I. Curve Za is situated at the left and curve ZO at the right 
side of GZ, (viz. when we go from G towards Z,). The part 
dZ,—= LZ, of the equilibrium (M) is, therefore, stable, the part 
dG = LG is metastable. 
Let us imagine in fig. 2 (VIII) the (M)-curve to be drawn also, 
which starts from 7 in accordance with fig. 1 (VIII) and which must 
be situated above the curves za and ib. The three singular curves 
(M), (Z) and (Z,) must then touch one another in 2. The three 
