( 453 ) 
it does not seen exaggerated to me, if I call a calculation, in which 
the change mentioned sub 1 is taken into account, but that mentioned 
sub 2 neglected, absurd. 
Let us now determine the connection between the different sheets 
of the -surface of a ternary mixture at given 7 and p, by applying 
the principle of continuity. For this it will be sufficient to show 
the connection between the three curves which are found in a section 
normal to the zy-plane and for simplicity ’s sake we shall begin 
with the three curves lying in the ¢-surface in the coordinate plane, 
for which y = 0. This is really the same thing as if we said that 
i) re 
Vv 
30 
Proceedings Royal Acad, Amsterdam Vol, LV. 
