. Carnegie Institution of Washington publication. CRYSTALLOGRAPHY OF THE HEMOGLOBINS OF AVES. 167 Oxyhemoglobin of Numida meleagris. Orthorhombic: Axial ratio a : b : 6 = : 1 : 6. Forms observed: Prism (110), base (001); and, in twins, unit pyramid (111). Angles: 110 A lTO=58° (normals); 110 A 001 =90°. The angle of the prism sometimes appears to approximate 60°, but ran down as low as 57°, and 58° seems to be the best 44 "Tb Fios. 44, 45, 46. NumiJa meleaffrii Oxyhemoglobin. Habit thin to thick tabular; the rhombic plates varying in thickness from one- tenth to one-fou
. Carnegie Institution of Washington publication. CRYSTALLOGRAPHY OF THE HEMOGLOBINS OF AVES. 167 Oxyhemoglobin of Numida meleagris. Orthorhombic: Axial ratio a : b : 6 = : 1 : 6. Forms observed: Prism (110), base (001); and, in twins, unit pyramid (111). Angles: 110 A lTO=58° (normals); 110 A 001 =90°. The angle of the prism sometimes appears to approximate 60°, but ran down as low as 57°, and 58° seems to be the best 44 "Tb Fios. 44, 45, 46. NumiJa meleaffrii Oxyhemoglobin. Habit thin to thick tabular; the rhombic plates varying in thickness from one- tenth to one-fourth of the long diagonal of the prism; the crystals consist simply of the short prism (110) and the base (001) (text figures 44 and 45). Twinning on the normal to the prism-base edge as twin axis (horse-type) common (text figure 46); also twins on the pyramid and perhaps a macrodome were observed. The crystals usually occur singly or in twins, not in more complicated groupings. Pleochroism strong; a very pale yellow-red, b moderately deep scarlet-red, c very deep red. Extinction on the base is symmetrical and on edge is straight in all positions. The plane of the optic axes is the macropinacoid; the orientation of the elasticity axes is a=6, b=a, c=(S. On the base, in convergent light, the biaxial interference figure is seen with the axes rather widely separated; hence Bxa = t and the optical character is positive. CARRIER PIGEON, Columba livia var. Plate 13. The bird was killed and bled and the blood allowed to form a clot. This clot was then ground in sand, with excess of ether, and the mixture centrifugalized; afterwards 2 per cent of ammonium oxalate was added and the preparations made as usual. Crystals began to form in about 2 hours. These crystals were Oxyhemoglobin, and formed only in the cold. When taken into a warm room they melted rapidly. Another preparation with and without oxalate was tried, but crystals did not form except when the oxalate was present. In th
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