294 



Consequently tlie temperatiiie ma}' as well increase as decrease, 

 and the pressure niaj increase or decrease as well at lising as at 

 failing temperature, dependent on the position of curve E. 



It follows from (12): 



when .i\ is extremely small with respect to .i\ and .r, then curve 

 E is situated between {G) and (L,) ; 



when .i\ is extremely small with respect to x^ and .c, then curve 

 E is situated between ((r) and (L,) ; 



when .1', is extremely small with I'espect to ,r, and x, then curve 

 E is situated between (L,) and (Lj ; 



when Xj is extremely large with respect to .r, and .r, then curve 

 E is situated in the vicinity of L^)\ 



when X, is extremely large with respect to .j\ and .r, then curve 

 E is situated in llie vicinity of (L,) ; 



when .t\ is extremely large with respect to .i\ and .i\ then curve 

 E is situated in the vicinity of (6r). 



In each of those cases we can see at once from the tigs 3 and 4 

 which signs {tlT),, and {dF)x may have. 



When f.i. x^ is very small with respect to .r, and .r, then curve 

 E is situated between (LJ and (6r); when now tig. 4 is valid then 

 the pressure shall, therefore, always increase and the temperature 

 shall decrease. In the special case only, when .c, is still also extremely 

 large with respect to .c, and when at the same time Af^^O[lhen 

 curve (6r) proceeds, slart-ing from /, a little to the left] then the 

 temperature may fall a little. 



When we add a new substance which is not volatile, but which 

 forms mixed crystals with the solid substance E, then we have in 

 figs. 3 and 4 the curves {F) {L,) and (L,). It appears from the 

 position of those curves with respect to one another that the previous 

 considerations are also valid in this case. 



When we wish to calculate {dT)j: then, as is apparent from (19) 

 we have to substitute in (36) 6 A F .c, by (A F -f A F') .c When we 

 neglect again the terms with A V then we find : 



3iidl%^[x-(l^a),;+aa;,\LV 

 or: 



{d2):^ = ——. . . (40) 



AH 2/,— .V, 



In the figs 5 and 6 YZ represents a side of the components- 

 triangle, E L^ Lj and G the four phases of the invariant binary 

 equilibrium £'(.r =i 0). When we add a new substance then the 

 ternary equilibrium E =^ E -\- L^ -\- L, -\- G arises. The solid sub- 



