258 



meiioii presents itself, that phase 111 melts at a temperature which 

 we know as the melting point of phase I. Thns it is shown that in 

 this way phase 111, during its formation, giadiially passed into phase 1. 

 Fig. Q is reproduced as it allows of studying the second point 

 of transition. At F ex-solid, at G ex-liquid pass into the isotropic 



-JO* 



Fig. 6. 

 phase under the absoi-ption of heat, H gives the phenomenon of 

 transition while heat is devel(>|ied and the thre« transitions FG 

 and H happen really at the same temperature. 



CONCLUSION. 



Whilst thus, as far as the situation of the points of transition is 

 concerned, we have found no indication of a difference between 

 exsolid and exliquid with para-azoxy-anisol, we have discovered 

 several phases in the solid condition of aggregation in our investigation. 

 Beside the three phases which we have distinguished as I, II and III, 

 there certaiidy still exists a fourth '), with a melting-point of about 

 108°. It seems that this phase, which during this investigation never 

 once showed itself, can only exist in capillary layers (between glass). 



This short, more or less schematic- summing up of the most 

 striking facts, which present themselves in an investigation of the 

 melting- and congelation phenomena of para-azoxy-anisol, must 

 suffice, however interesting a closer examination of this substance 

 and perhaps of other substances according to the method indicated 

 may be from a standpoint of phase-theory, for our interest is greater 

 for problems of a different nature. 



Physical Laboratory, Institute for Tkeoretical Physics. 

 Utrecht, September 19J7. 



1) Gf. our second contribution. Verslag Kon. Acad. v. Wetensch. XXV. p. 1114. 



