. Carnegie Institution of Washington publication. 262 CRYSTALLOGRAPHY OF THE HEMOGLOBINS OF THE a rather dusky interference figure was observed, showing one brush of the biaxial figure, with traces of the other brush in certain positions. The bisectrix of the optic axes is evidently the axis of greatest elasticity Bxa = a, and the optical character is hence negative. SLOTH BEAR, Melursus ursinus. Plates 71 and 72. The specimen was received from the Philadelphia Zoological Gardens and was in a very putrid condition. The blood was oxalated, laked with ether, and centrifugalized to obtain the cle
. Carnegie Institution of Washington publication. 262 CRYSTALLOGRAPHY OF THE HEMOGLOBINS OF THE a rather dusky interference figure was observed, showing one brush of the biaxial figure, with traces of the other brush in certain positions. The bisectrix of the optic axes is evidently the axis of greatest elasticity Bxa = a, and the optical character is hence negative. SLOTH BEAR, Melursus ursinus. Plates 71 and 72. The specimen was received from the Philadelphia Zoological Gardens and was in a very putrid condition. The blood was oxalated, laked with ether, and centrifugalized to obtain the clear solution from which the slide preparations were made. The blood crystallized readily at room tempera- ture, and the crystals were fairly permanent. These first crystals were frequently, but not always, twinned, as was the case with the crystals from the bloods of other bears examined. As in other cases, too, a second crop of crystals formed that were more perfect than those of the first crop; and these were not so frequently twinned. The crystals, especially those of the second crop, kept well and did not dissolve in the solution. They were of the monoclinic sphenoidal class (tartaric-acid type) as in the other bears, but occasionally a slide would contain a few crystals which appeared to be of more symmetrical character. They all appeared to be oxyhemoglobin. Oxyhernoglobin of Melursus ursinus. Monoclinic hemimorphic, monoclinic sphenoidal (tar- taric-acid type): Axial ratio a : b : 6 = : 1 : ; /? = 68°40' (calculated). Forms observed: Unit pyramid (Til), unit prism (1TO), orthopinacoid (100), orthodome (101), base (001); in twins, prism (230). Angles: Traces of unit prism or unit pyramid on the base, angle of the edges 110-001 A 1TT-001=75° 35'; prism to base TlO A 001=77°, unit pyramid to base Til A 001 =48° 15'. Habit thin tabular on the base, the bounding planes being on one end of the ortho-axis the unit prism (1TO), and on the other end the unit pyramid
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