IO E. BERNER. M.-N. KI. 
Axial angle 8. = 94° r1*. 
Ratio of axes: a :bic = 1,9862:1 : 06,6564: 
The crystals are elongated along the edge a:r. 
Forms observed: frequently: a }1oo}, m j110|, u \ITol, s }1o1|, a jxor|, 
"90r, ¢ Zor; rarely: jsor| and 1 454. 
Fig. 5 a shows a crystal of the laevorotary acid and fig. 5 b one of 
the dextrorotary acid. 
The results of measurement of the angles are given in table D. 
Cleavage perfect parallel to a }100\, imperfect parallel to 2 \oro!. 
By means of alcohol, figures were etched on a j100j showing the en- 
antiomorphism of the d- and the l.acid. Fig. 6a is the etched figures on 
the l.acid and fig. 6b those on the d-acid. 
The plane of the optic axes is 2610|; 2 E — ca. 880 
The first median line lies in the obtuse angle B, and inclines ca. 10? 
to the c-axis. 
