. Carnegie Institution of Washington publication. \. 173 FIGB. 169, 170, 171. Ovit nahura Oxyhemoglobin. Flos. 172, 173. Ovit nahura Reduced Hemoglobin. Habit prismatic, elongated on the vertical axis, forming prisms with the ends terminated obliquely by the base (text figure 169), the plane angle of the trace of the base on the prism being about 83°, but not exactly determined; also in lath-shaped crystals, by flattening on two opposite prism faces, the ends then terminated by the oblique plane of the base producing a triclinic aspect (text figure 170) ; and in this form often with the prism
. Carnegie Institution of Washington publication. \. 173 FIGB. 169, 170, 171. Ovit nahura Oxyhemoglobin. Flos. 172, 173. Ovit nahura Reduced Hemoglobin. Habit prismatic, elongated on the vertical axis, forming prisms with the ends terminated obliquely by the base (text figure 169), the plane angle of the trace of the base on the prism being about 83°, but not exactly determined; also in lath-shaped crystals, by flattening on two opposite prism faces, the ends then terminated by the oblique plane of the base producing a triclinic aspect (text figure 170) ; and in this form often with the prism so shortened that the rhombic plates appear to be triclinic tables with plane angles of 63°. Twins on the flattened prism, resembling carlsbad twins (text figure 171), rather rare; also commonly twins on the orthopinacoid and on the hemi- orthodome as in sheep (text figure 166). This second kind of twinning forms both pentag- onal groups, as in sheep, and also networks of rod-like crystals, this latter perhaps by twinning on the base instead of the orthopinacoid (see plate 43) . The little pentagonal groups grow attached to the long prism-like crystals, as in the sheep crystals, and produce a cross-barred effect upon the orthopinacoid surfaces, due to the strong pleochroism. The crystals strongly resemble those of the sheep in these twins, but the prismatic habit is different. A third kind of twinning on a prism, producing an X-shaped interpenetrant twin, was seen, but it occurred very rarely. The pentagonal twins are much more irregular than in the sheep crystals; and they show usually a skeleton form, instead of even-sided pen- tagons, due to parallel growth. The description of this twin will be found under Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washin
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