Molecular weight: 337.11. 



Radius of the Capillary tube: 0.05265. 

 Depth: 0.1 mm. 



The compound was prepared by the method described by W. Kasten 

 (Dissertation, Halle, 1909 p. 41), and purified by repeated crystallisations. 

 Contrary to the data given there, we found the transition-points to be: 95° C. 

 into the anisotropous, greenishly opalescent liquid, and 117°.8 C. into the 

 amorphous liquid. If every crystallisation-germ is excluded, the liquid can be 

 undercooled to about 79° ; it remains then only slightly viscous, and has a 

 yellow colour. In this case also the temperature-coefficient of the surface- 

 energy is extremely small; nor does the break in the curve at the transition- 

 temperature seem to be of any considerable magnitude. 



The density at 95° C. was: 1.0673; at 115° C. 1.0491. For the anisotropous 

 liquid thedensity may thus be calculated from: t/^o= 1.0809 — 0.000905 (?- 80 ). 

 For the isotropous liquid at 120^ was found: 1.0428; at 140° C: 1.0257; at 

 160^ C: 1.0C86. In general at r C: rf^o = 1 0599-0 000855(^—100). (Only to 



be used for temperatures from 117' upwards). 



With the exception of the sudden increase of /•' in the neighbourhood of 

 117" C, the temperature-coefficient of y is here exceptionally small; for the 

 isotropous liquid moreover it increases gradually with rise of temperature, 

 and with a gradient of about 0.33 Erg per degree. The entire behaviour is 

 very strange and enigmatic. 



^ 3. If now we review in the first instance the results obtained 

 with the three first-tnentioned compounds, it will immediately attract 

 attention that the corresponding ft-/-curves have all a completely 

 analogous shape : this shows two branches, of which the first has 

 regard to the anisotropous, the second to the isotropous liquid 



