. Carnegie Institution of Washington publication. OF PISCES, BATRACHIA, AND REPTILIA. 159 a-Oxyhemoglobin of Python, molurus. Monoclinic: Axial ratio a : 6 : <! = :!:<*; /3=65° (about). Forms observed: Prism (110), base (001), orthopinacoid (100). Angles: Traces of 110 A 1TO on base =84° (normals); 100 A 001=65°=^. The angle of the prism varied from 81° to 86°, but the best measurements ran very close to 84°. Habit (a), long lath-shaped crystals with oblique ends, due to elongation on the ortho-axis, with the combination (001) (100), and two faces of the prism 110 and HO (text figur
. Carnegie Institution of Washington publication. OF PISCES, BATRACHIA, AND REPTILIA. 159 a-Oxyhemoglobin of Python, molurus. Monoclinic: Axial ratio a : 6 : <! = :!:<*; /3=65° (about). Forms observed: Prism (110), base (001), orthopinacoid (100). Angles: Traces of 110 A 1TO on base =84° (normals); 100 A 001=65°=^. The angle of the prism varied from 81° to 86°, but the best measurements ran very close to 84°. Habit (a), long lath-shaped crystals with oblique ends, due to elongation on the ortho-axis, with the combination (001) (100), and two faces of the prism 110 and HO (text figure 25); these appeared first in the fresh blood. Habit (b) tabular by development on (001) with a short prism (110) (text figures 26, 27; also plate 7, figures 39 to 42); these appeared later in the fresh blood and were the common type in the stale blood. Habit (b), the tabular, crystals were also seen with the combination of habit (a), but distinctly tabular. The crystals of habit (a) and these occasional crystals of habit (b), which show the same planes, are distinctly clinohedral or domatic in form, that is, hemimorphic on an axis normal to the ortho-axis. But habit (b), which appears to be the normal form of crystal of the oxyhemoglobin, is only occasionally seen in these clinohedral crystals. Homogeneous regular growths occur, the crystals having a common prism-basal- pinacoid edge and uniting on the base (text figure 28). This closely resembles the mica twin. It appears, sometimes, to be repeated in irregular order and probably accounts for anomalous extinction seen in a few large, apparently composite, crystals. Seen in edge view the twin is readily recognized by the different extinction angles in the several parts of the composite crystal (text figure 29), which shows the twin in section, examined along the axis a/ FIGS. 25, 26, 27, 28, 29. Python mobtrut a-Oxyhemoglobin. The color of the crystals is deep oxyhemoglobin red. Pleochroism is rather strong in both
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