. Carnegie Institution of Washington publication. 204 CRYSTALLOGRAPHY OP HEMOGLOBINS OF THE UNGULATES. Pleochroism was strong, as is common in reduced hemoglobin; a pale pink, nearly colorless; b purplish, deeper than a; c deep purplish-red. Absorption was in the order c > b > a. Extinction on the base was straight; on edge views the extinction angle was about 30° with the length of the rod-like section. The plane of the optic axes is the plane of symmetry; the orientation of the elasticity axes is a A a =30°, b —b, c A 6 =30°. On the base, in convergent polarized light, a single brush o
. Carnegie Institution of Washington publication. 204 CRYSTALLOGRAPHY OP HEMOGLOBINS OF THE UNGULATES. Pleochroism was strong, as is common in reduced hemoglobin; a pale pink, nearly colorless; b purplish, deeper than a; c deep purplish-red. Absorption was in the order c > b > a. Extinction on the base was straight; on edge views the extinction angle was about 30° with the length of the rod-like section. The plane of the optic axes is the plane of symmetry; the orientation of the elasticity axes is a A a =30°, b —b, c A 6 =30°. On the base, in convergent polarized light, a single brush of a biaxial interference figure is seen, the optic axis emerging at a small angle with c or the normal to the plate; the acute bisectrix is hence evidently c, and the optical character is positive. VENEZUELA DEER, Mazama americana savannarum (?). Plate 36. The specimen of blood was received from the National Zoological Park at Washington during the summer and was kept frozen until examined. The quantity of blood was small, and it was quite thick and putrid, and full of extraneous matter. This latter was centrifugalized off as far as possible, but the specimen was not thoroughly cleansed, owing to an accident to the centrifugal machine. The slides were prepared in the usual manner, and crystals formed readily in the cold. They were not dissolved at a tempera- ture of 10° C. A spectroscopic examination of the plasma showed the presence of oxyhemoglobin, but only crystals of reduced hemoglobin were obtained, they being determined as such by the microspectroscope. Reduced Hemoglobin of Mazama americana savannarum. Monoclinic: Axial ratio not determinable as the pinacoids only are developed. The angle /? seems to be 90°. Forms observed: Base (001), clinopinacoid (010), orthopinacoid (100). Angles: Clinopinacoid to orthopinacoid, the outline of the plates 010 A 100=90°; base to orthopinacoid 001 A 100=90°=^. The third angle could not be obtained, but is necessarily 90°. Hab
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