. Carnegie Institution of Washington publication. 256 CRYSTALLOGRAPHY OF THE HEMOGLOBINS OF THE Oxyhemoglobin of Lutra canadensis. Monoclinic domatic or clinohedral: Axial ratio a ?6 =:1: ; /9 = 72°. Forms observed: Unit prism (110), hemiorthodomes (101) and (T01), clinopinacoid (010), base (001). Angles: Traces of the prism on the base, edges 110-001 A 110-001=101°; ortho- dome on base T01 A 001=49°; prism edge on the base, edge 110-lTO A OOT=72°=/3. Habit tabular on the base, the crystal consisting of base (001), unit prism (110) and hemiorthodomes (101) and (10T), the domes appe
. Carnegie Institution of Washington publication. 256 CRYSTALLOGRAPHY OF THE HEMOGLOBINS OF THE Oxyhemoglobin of Lutra canadensis. Monoclinic domatic or clinohedral: Axial ratio a ?6 =:1: ; /9 = 72°. Forms observed: Unit prism (110), hemiorthodomes (101) and (T01), clinopinacoid (010), base (001). Angles: Traces of the prism on the base, edges 110-001 A 110-001=101°; ortho- dome on base T01 A 001=49°; prism edge on the base, edge 110-lTO A OOT=72°=/3. Habit tabular on the base, the crystal consisting of base (001), unit prism (110) and hemiorthodomes (101) and (10T), the domes appearing at one end of the clino-axis only, indicating clinohedral symmetry (text figures 276 and 277). When the plates are very thin they appear to be orthorhombic hemimorphic, but as they increase in thickness they assume a monoclinic habit. In some cases the crystals seem to be the combination (110), (001), (111) (101) (10T), but the unit pyramid was not positively established. The crystals grow singly or in aggregates of two or three together on the base in parallel growth. Twins on the orthodome, or what appears to be a contact of the orthopinacoid on the base, occur; but the orthopinacoid was not observed as a plane. A few crystals of prismatic habit were seen; they seemed to be elongated on the unit prism. The edge views of the plates also appear to be prismatic at first sight, but an inspection of the ends shows the orientation and the clinohedral habit, except when looking along the clino-axis. Pleochroism is strong; a nearly colorless, pale reddish, b rather strong red, c deep red. Double refraction is strong; extinction on the plates normal to the base is symmetrical; on edge, looking along the clino-axis, the extinction is straight. Extinctions up to 15° were observed on edge views, apparently normal to the clinopinacoid. On the base, in convergent light, the biaxial interference figure was observed with widely separated brushes, with the plane of the optic axes n
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