56SHORT COMMUNICATIONS 57-162 rnm. having been determinated by calibration with sodium chloride. The dimensions of the unit cell were found to be: ao=7-37±0.02, b0=4.60±0.02, c0=14-34±0.03/~; fl = 108 ° 59' +_ 8'.These data give the axial ratios: a: b : c = 1.602:1 : 3.118. The observed density of 1.42 g.cm.-a agrees well with the density of 1.417 g.cm. -3 calculated on the basis of two formula units per unit cell.When the diffraction spots in the Weissenberg and precession photographs were indexed the following interferences were observed: hkl in all orders; hO1 when l = 2n; 0/c0 when /c = 2n. These data are consistent with the space group C~t~-P21/c. Structural investigations on 5-oxiphenazine and 5-10-dioxiphenazine are in progress.
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