. Carnegie Institution of Washington publication. 184 CRYSTALLOGRAPHY OF THE HEMOGLOBINS Angles: Traces of unit prism on base, edges 110-001 A 110-001=95° (85°); of the clinoprism on base, edges 230-001 A 230-001=75° (105°); base to prism edge (6 A 6) 001 A 110-110=90°; base to prism edge (6 A a) 001 A 110-lTO=/3 = 55°. Habit short prismatic to tabular, the tabular crystals formed by the unit prism and base being nearly square in outline (text figure 87). The more prismatic crystals showed the unit prism and base, and varied from equidimensional blocks to prisms with a length equal to 3 to 4 t
. Carnegie Institution of Washington publication. 184 CRYSTALLOGRAPHY OF THE HEMOGLOBINS Angles: Traces of unit prism on base, edges 110-001 A 110-001=95° (85°); of the clinoprism on base, edges 230-001 A 230-001=75° (105°); base to prism edge (6 A 6) 001 A 110-110=90°; base to prism edge (6 A a) 001 A 110-lTO=/3 = 55°. Habit short prismatic to tabular, the tabular crystals formed by the unit prism and base being nearly square in outline (text figure 87). The more prismatic crystals showed the unit prism and base, and varied from equidimensional blocks to prisms with a length equal to 3 to 4 times the thickness. The prismatic crystals were sometimes the clinoprism (230) (text figure 88), but combinations of this prism with the unit prism were not observed. The crystals, especially those of the prismatic type, aggregated themselves in stellate groups by growing together in the orthodome zone, but definite twins were not observed. Crystals growing along the cover edge were often elongated into long, prismatic-looking forms, growing in tufts. These were usually edge views of the plates, which also occasionally aggregated together by uniting on the base, or on faces vicinal to the base, but without definite twinning orientation. /\. a Flos. 84,85. Thylacynua cynocephtilus a-Oxyhemoglobin. FIG. 86. Thylacynug cynncephahia 0-Oxyhemoglobin. FIGH. Trichositrua vulpecula Oxyhemoglobin. On account of the deep color of the plasma the pleochroic colors could not be defi- nitely observed, but the crystals are strongly pleochroic, with absorption c > 6 > a. On the base, the crystal extinguishes symmetrically, with the axis of greater elasticity bisecting the acute angle of the plate. On the clinopinacoid sections the extinction is oblique, making an angle of 9° with the edge 010-001 or with the clino-axis, a, in the obtuse angle. The plane of the optic axes is normal to the plane of symmetry and a =b. The orientation of the other elasticity axes is, 6 A a =9°
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