79 
melts at 78° C., and crystallizes from ligroin in big, colourless, 
strongly refracting crystals of tabular or prismatic aspect. Ordinarily 
Fig. 4. o-Methoxy-m-methyl-a-anilido-ethylbenzene. 
they manifest curved faces, exact measurements thus being rather 
difficult. 
Rhombic-bipyramidal. 
a: b=0,3301-; 1. 
Forms observed: c= {001} predominant; a={100} and 6—=}010}, 
yielding good reflections; m= {110}, small, but lustrous. 
Angular values : Observed: Calculated: 
am, = OO (HOL 18-16 — 
bemi Op — AE 71° 44’ 
All other angles are 90°. 
A good cleavage was found parallel to {100} and {010}. 
The optical axial plane is {100}, with the b-axis as first bisector. 
The angle of the optical axes is very small, with extraordinarily 
strong dispersion: @ >v; the apparent angle of the axes in oil 
(n = 1,54) was about 48° for the red, and about 25° for the violet 
rays. On {001} corrosion-figures were obtained of rectangular form, 
in agreement. with the adopted crystallographical symmetry. 
At 16°C. the specific of the crystals was: 1,098; the equivalent- 
volume therefore, being: 219,49. | 
§ 6. V. 0o-Oxy-benzylidene-aniline. ') 
This compound, having the formula: 
C} 
oN 
OH 
CH=N—C, H; 
1) Conf. also: L. Duparc, Ann. d. Chemie, 266, 140 (1891); here & is taken 
as {001}, the axial ratio, therefore becoming: c’: b’: a’ = 4,586:1: 2, 1922. (In 
Duparc’s paper a: 0 is erroneously taken ten times too small, and the a- and c- 
axes are interchanged. The crystals are identical with ours. 
