. Carnegie Institution of Washington publication. CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE UNGULATES. 215 Habit prismatic, the first crystals to form consisting of the unit prism and brachy- dome (054) in prisms about 4 times as long as the width on the macro-axis (see text figure 174). Later, as the solution becomes more concentrated, other planes develop and the brachyprism (120) predominates, the unit prism being reduced to a bevel on the brachyprism; in these crystals the two brachydomes (Oil) and (054), the former predom- inant, sometimes develop with a small macrodome (302) (text figure 175

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. Carnegie Institution of Washington publication. CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE UNGULATES. 215 Habit prismatic, the first crystals to form consisting of the unit prism and brachy- dome (054) in prisms about 4 times as long as the width on the macro-axis (see text figure 174). Later, as the solution becomes more concentrated, other planes develop and the brachyprism (120) predominates, the unit prism being reduced to a bevel on the brachyprism; in these crystals the two brachydomes (Oil) and (054), the former predom- inant, sometimes develop with a small macrodome (302) (text figure 175) or the pyramid (221) with (054) and (302) (text figure 176). The crystals from the concentrated solution are hence of two types, in both of which the prism taken as the brachyprism predomi- nates; but both of these types occurred sparingly and in a few slides. The crystals often grow in tufts from the oxalate crystals which separate from the supersaturated oxalate solution; usually, however, they occur singly, scattered through the slides or massed in the protein ring and along the cover edge. Twinning was observed on a pyramid, which appears to be the observed pyramid (221) ; these are interpenetrant twins (text figure 177). The deep color of the solution in most cases conceals the pleochroism, but in thin slides it is quite marked; a is colorless to pale red; & is pink to red; c is deep blood-red; on sections showing b and c the pleochroism is not pronounced. Extinction is straight in all aspects of the crystals. The orientation of the elasticity axes is a =6, b=a, c=6. The plane of the optic axes is hence the macropinacoid; and on basal sections in con- vergent light the biaxial interference figure is visible with the axes rather widely sepa- rated, 2E=75°, about. The axis of greatest elasticity a is hence the acute bisectrix, Bxa = a and the optical character is negative. A A. 178 FIGS. 174, 175, 170, 177. Bos laurua Oxyliemoglobin. FIG. 178. BOB biton Oxyhemoglobin.