534 



is always smaller tlian 180°. When we determine in a similar way 

 the position of tlie other regions, we find a partition as in fig. 2. 



Tlie following is apparent from tig. 2. Wiien we move, starting 

 from a point of the curve (J), aronnd the (piinla|)lepoint, the snccession 

 of the curves is: (1), (2), (3), (4), (5) or the reverse order (1), (5), 

 (4), (3), (2); we shall express this in the following way: 



"The curves follow one another in diagonal order". 



Further it is apparent that the |)arlition of the cuives is symmetrical 

 in that respect, that we find between every two curves the meta- 

 stable part of another curve. Also we see that the regions are 

 divided symmetrically with I'espect to the different curves. 



This symmeti'ical position of curves and regions with respect to 

 one another is based of course on fig. 1 ; this is viz. also symme- 

 trical in so far that each phase is situated outside the quadrangle, 

 which is formed by the four other |)hases. 



Further we see in fig. 2 again the confirmation of the rule that 

 each region which extends over the metastable or stable part of a 

 curve [Fj,) contains the phase F^j. Let us take e.g. curve (1); the 

 region 134 extends over the stable part of this curve, (he regions 

 124, 125 and 135 extend over the metastable part; each of these 

 regions contains the phase 1. 



Type II. Now we consider the case that the five phases form 

 the auglepoints of a monoconcave quintangle ffig. 3). In order 

 to determine the position of the curves (1) — (5) we take the five 

 reactions : 



4 + 5^2 + 3 1+5;^ 3 + 4 



(4) (5) I (1) j (2) (3) (1) (5) I (2) I (3) (4) 



1 -l_ 2 -f- 5 :;^ 4 2 + 3:;!:i + 5 



(1)(2)(5) 1 (3) 1 (4) (2) (3) I (4) | (J) (5) 



4^1+2+3 



(4) I (5) I (1) (2) (3) 



Now we draw in a /', 7'-diagram (fig. 4) the curves (1) and (2) ; 

 for fixing the ideas we take (2) at the right of (J). According to 

 this the above-mentioned reactions, which refer to the phases of the 

 curves (1) and (2) have been written at once in such a way that 

 herein curve (2) is situated at the right of (1). 



It follows at once from the first and the second of the reactions 

 above, that curve (3) is situated at the right of (1) and (2). Conse- 

 quently curve (3) is situated, as is also drawn in (fig. 4) witiiin the 



(4) 



