. Carnegie Institution of Washington publication. CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE RODENTIA. 221 refraction is very weak. The elasticity for the ordinary ray, oj, is somewhat greater than for the extraordinary ray or « > aj in refraction indices, and the optical character is hence weakly positive. GRAY SQUIRREL, Sciurus carolinensis. Plates 46 and 47. The living animal was obtained from a collector at Newport News, Virginia, and was bled in the laboratory. The oxalated blood was laked with ether and centrifugalized, and the slide preparations made in the usual manner. Crystals formed m
. Carnegie Institution of Washington publication. CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE RODENTIA. 221 refraction is very weak. The elasticity for the ordinary ray, oj, is somewhat greater than for the extraordinary ray or « > aj in refraction indices, and the optical character is hence weakly positive. GRAY SQUIRREL, Sciurus carolinensis. Plates 46 and 47. The living animal was obtained from a collector at Newport News, Virginia, and was bled in the laboratory. The oxalated blood was laked with ether and centrifugalized, and the slide preparations made in the usual manner. Crystals formed more slowly than with the other squirrels examined; they were larger and showed more tendency to produce com- posite crystals than in the other species. They showed no tendency to dissolve, however, and are evidently quite difficultly soluble in the plasma. Examination with the microspectroscope shows that these crystals are typical 187 FIGS. 184,185. Sciurut rufivcnter neglectut Oxyhemoglobin. FIGS. 186,187. Sciurut carolinentie Oxyhemoglobin. Oxy hemoglobin of Sciurus carolinensis. Orthorhombic; pseudohexagonal: Axial ratio a : b : c = : 1 : 6. Forms observed: Unit prism (110), brachypinacoid (010), basal pinacoid (001); or, as pseudohexagonal, prism and base. Angles: Prism angle 110 A 110=60° (normals); prism to brachypinacoid 110 A 010=60° (normals), the two making a perfect hexagonal plate; prism to base 110 A 001=90°. Habit pseudohexagonal, tabular on the base, and with the prism and brachypina- coid faces in equilibrium, so that the plate is a perfect hexagon; sometimes, however, the plate is elongated on the brachy-axis, producing a distinctly orthorhombic habit (text figures 186, 187). The plates are large and perfect hexagons, but are not often simple; they produce groups by piling up on the base, more or less concentrically, and often with curving of the crystals, producing the form of the "eisen rose" of hematite, (see plate 47, fig
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