. Carnegie Institution of Washington publication. 180 CRYSTALLOGRAPHY OF THE HEMOGLOBINS Oxyhemoglobin of Sarcophilus ursinus. Monoclinic: Axial ratio a : b : 6 = :!:<!; /3=69° (111°). Forms observed: Prism (110), base (001), clinopinacoid (010); also in twins (Til) a positive hemipyramid, of which the angle was not determined. Angles: Traces of prism on the base, edge 110-001 A 110-001=58° (122°); edge of 110-lTO A 001=/3 = 69° (111°). Habit prismatic, also tabular; the first crystals to appear are usually long thin prisms and also shorter prisms with the length varying from 20 times
. Carnegie Institution of Washington publication. 180 CRYSTALLOGRAPHY OF THE HEMOGLOBINS Oxyhemoglobin of Sarcophilus ursinus. Monoclinic: Axial ratio a : b : 6 = :!:<!; /3=69° (111°). Forms observed: Prism (110), base (001), clinopinacoid (010); also in twins (Til) a positive hemipyramid, of which the angle was not determined. Angles: Traces of prism on the base, edge 110-001 A 110-001=58° (122°); edge of 110-lTO A 001=/3 = 69° (111°). Habit prismatic, also tabular; the first crystals to appear are usually long thin prisms and also shorter prisms with the length varying from 20 times to 6 times the thickness (text figure 71); later nearly equidimensional blocks appear, short prisms with ratio of length to thickness varying from 2 : 1 to 1 : 2 (text figure 72); finally a few crystals become tabular on the base, with the prism reduced to perhaps one-tenth of the thickness or width of plate (text figures 73 and 74). Twinning was observed with the plane of twinning and composition plane the prism face (twin on the prism), both contact (text figure 75) and interpenetrant (text figure 76) twins; also long prisms twinned on a positive hemipyramid, of which the angle was not determined, called (Til), as the plane of twinning and the twinning axis normal to this plane; these were inter- penetrant twins. n\ 7i. 7". If, FIGS. 71, 72, 73, 74, 75, 76. Sarcophilug urginua Oxyhemoglobin. Pleochroism strong; a pale yellowish, nearly colorless; b red, c deep red. Extinc- tion is symmetrical on the base in the plates and all sections in zone of b; on side view, on (010) the extinction is oblique with an extinction angle of 10° from the prism edge, or 11° from the trace of the base (001). The axial plane is the plane of symmetry (010) and the orientation of the elasticity axes is c A t = 10° lying in the obtuse angle; a A a = 11° in the obtuse angle; b=b. The interference figure is seen on this basal section, with the brushes slightly unsymmetrical and rather w
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