. Carnegie Institution of Washington publication. CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE UNGULATES. Oxyhemoglobin of Tragulus meminna. = 63°. 201 Monoclinic: Axial ratio a : b : t = : 1 : 6; /? = Forms observed: Unit prism (110), base (001). Angles: Traces of prism on the base, edges 110-001 A 110-001=59°; true angle 110 A 1TO = 64° 50' (calculated); prism edge to base, edge 110-110 A 001 = 63° (normals) =/?. Habit of the single crystals tabular on the base (text figures 142, 143), the plate bounded by the prism faces, generally symmetrical or nearly so; but most of the crystals are twinne
. Carnegie Institution of Washington publication. CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE UNGULATES. Oxyhemoglobin of Tragulus meminna. = 63°. 201 Monoclinic: Axial ratio a : b : t = : 1 : 6; /? = Forms observed: Unit prism (110), base (001). Angles: Traces of prism on the base, edges 110-001 A 110-001=59°; true angle 110 A 1TO = 64° 50' (calculated); prism edge to base, edge 110-110 A 001 = 63° (normals) =/?. Habit of the single crystals tabular on the base (text figures 142, 143), the plate bounded by the prism faces, generally symmetrical or nearly so; but most of the crystals are twinned with the prism-base edge (110-001) as twin edge and a normal to this edge in the plane of the base as the twin axis (text figures 144 and 145). In these twins the composition face is the base and along one of the prism-base edges, where they unite, there is a reentrant angle, while on the opposite edge there is an ordinary dihedral angle. In these twins (horse-type), which are common in all hemoglobins with angles that approximate 60°, the compound crystal in this species is usually elongated along the common edge, and the two crystals overlap each other at the ends of this elongated crystal forming reentrant angles in the outlines of these ends. The twinning is frequently repeated in polysynthetic order; and it is often complicated by parallel growth in one or more of the members of the twin. It does not appear to tend to produce hexagonal forms by twinning on more than one pair of the prism-base edges, however, as is com- monly the case in this kind of twinning. Twinning on the base as twin plane is also found apparently, but it is rare. This twinning seems to tend to make the angle of the plate nearer 60°. In some cases the opposite prism-base edges do not appear to be par- allel, due perhaps to a vicinal prism face in one member of the twin; this non-parallelism would tend to average the angles to near 60°.. 147 FIGS. 142, 143, 144, 145. Tragulus meminna Oxyhemoglo
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