. Carnegie Institution of Washington publication. 232 CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE RODENTIA. NORWAY OR BROWN RAT, Mus norvegicus. Plate 54. The specimen of blood was received from the Wistar Institute of Anat- omy, Philadelphia. The animal was bled into oxalate, and the blood used immediately. On laking, the blood at once began to crystallize, and within a few minutes a considerable amount of the crystals of oxyhemoglobin had formed in the tube. These were separated by centrifugalization, and from the clear mother-liquor the slide preparations were made. After cover- ing the slides cr
. Carnegie Institution of Washington publication. 232 CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE RODENTIA. NORWAY OR BROWN RAT, Mus norvegicus. Plate 54. The specimen of blood was received from the Wistar Institute of Anat- omy, Philadelphia. The animal was bled into oxalate, and the blood used immediately. On laking, the blood at once began to crystallize, and within a few minutes a considerable amount of the crystals of oxyhemoglobin had formed in the tube. These were separated by centrifugalization, and from the clear mother-liquor the slide preparations were made. After cover- ing the slides crystals formed rapidly, and they were quite insoluble. The color of the plasma was almost entirely discharged, showing the crystal- lization to be nearly complete. The crystals were small and thin, as in the case of the white rat. They kept well and showed no tendency to dissolve. N/213 Fios. 212, 213, 214, 215, 216, 217. Mia noruegicut a-Oxyhemoglobin. upon moderate increase of temperature. Even after a month the form of the crystals in the slides had not changed materially. The crystals were oxyhemoglobin. Two forms of the oxyhemoglobin appeared: one pris- matic, and probably orthorhombic, like the white-rat oxyhemoglobin; the other isotropic and apparently isometric, but showing hexagonal out- lines. The prismatic form was the first to appear; the isotropic form developing later may be an isomer of the first form or a mimetic twin. They are distinguished as a-oxyhemoglobin and /3-oxyhemoglobin. a-Oxyhemoglobin of Mus norvegicus. Orthorhombic: Axial ratio a : b : 6 = : 1 : Angles: Brachydome angle Oil A Oil =72° 30'; the prism angle was not observed, but was calculated as 76° 7'; profile of dome edges over pole when the prism lies on its side, edges 110-011 A TTO-OTl = 120°; this is the plane angle of the dome on the prism. Habit of the first crystals to form prismatic and generally flattened on two opposite prism faces, making a six-sided tabular crystal elon
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