. Carnegie Institution of Washington publication. 226 CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE RODENTIA. show. The crystal is very thin so that the a direction is very short. The pleochroism on the flat is b pale yellowish-red, c pale red; or, when very thin, 6 colorless and c pale pink. On edge view the crystal shows probably from 5 to 10 times the thickness seen on the flat, and the colors are deeper; a pale pink, c deep red. On the flat aspect in con- vergent light a pair of dusky brushes of a biaxial interference figure shows; the conjugate axis is the long dimension of the lath c, but the br
. Carnegie Institution of Washington publication. 226 CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE RODENTIA. show. The crystal is very thin so that the a direction is very short. The pleochroism on the flat is b pale yellowish-red, c pale red; or, when very thin, 6 colorless and c pale pink. On edge view the crystal shows probably from 5 to 10 times the thickness seen on the flat, and the colors are deeper; a pale pink, c deep red. On the flat aspect in con- vergent light a pair of dusky brushes of a biaxial interference figure shows; the conjugate axis is the long dimension of the lath c, but the brushes pass out of the field on rotation of the crystal. It seems probable from this that the acute bisectrix of the optic axes Bxa=c, and the optical character is positive. Calling the flat side of the lath the macro- pinacoid, the narrow edge the brachypinacoid and the dome a brachydome, the orienta- tion of the elasticity axes is a=a, b=6, c=<<; and the axial plane is the brachypinacoid. ir-Oxyhemoglobin of Marmota monax. Monoclinic: Axial ratio a : b : 6 = : 1 : 6; /? near 90° (?). Forms observed: Unit prism (110), base (001). Angles: Prism angle 110 A HO =58° (about); the angle /? was not exactly observed, but appears to be near 90°.. 193 Flo. 193. Marmota monax fl-Oxyhemoglobin. FIGS. 194. 195, 196. Marmota monax y-Oxyhsmoglobm. Habit thin tabular, consisting of the basal pinacoid, bounded by the unit prism (text figures 194, 195); but the crystals rarely occur singly, they form groups radiating from a center both on edge and on the flat (see plate 50). They occurred sparingly as a second growth in preparations made from whole blood, and appeared to be more soluble than the a and /^-crystals. The prism faces at first were curved, making measurement of the prism angle impossible, but later the crystals became more perfect. Single rhombic plates were rare, but the groups were not all irregular. Twinning is the normal type for these rhombic plates ("horse-t
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