A 5 10 15 
20 25 30 
Mol. 0/, 
In the above figure AB represents the proportions of azoxyanisol 
(A) and hydroquinone (B); the vertical axis represents the tempe- 
rature. Substance B has a melting point at D : 169°. Substance A, 
however, which is solid below # (condition Ag) passes above H = 114° 
into the condition of liquid crystals A, which may be recognised by 
the eye as an apparently turbid liquid which passes at C = 135° 
into an isotropic clear yellow liquid. 
If the liquid crystals are really looked upon as crystals for which 
there are sound reasons, then C is the melting point and Ka transi- 
tion point from A, into As. 
In the liquid condition A and B are completely miscible above 
C and D. Below these temperatures, the mixing-limits for the diffe- 
rent concentrations are CH, HK and KD. 
On the line DK commences the separation of B, on HK of solid 
A, (K = 106° and 25 mol. °/,), but on the line CH liquid mixed 
crystals are deposited. Consequently, to CH a second line CG must 
be added which shows the composition of the adjoining liquid mixed 
crystals. This line is the key to the important phenomenon which I 
have in view. The formation of the liquid mixed crystals takes place 
regularly on cooling any liquid-mixture below CH and is completed 
below CG. The clear liquid has then completely disappeared and has 
made room for the liquid crystals. 
