. Carnegie Institution of Washington publication. 192 CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE UNGULATES. 1 : 10, or even flatter in very large rhombic plates; rarely in prismatic development with the above ratio 2:1. The crystals are normally twinned "horse-type twin" (text figures 110 and 111), with the two parts united along a prism-base edge and the axis of the hemitrope twin normal to this common edge and in the basal pinacoid, which is the ordinary composition plane. In some cases this composition plane is the plane normal to the base, that includes the common edge, or is the so-c
. Carnegie Institution of Washington publication. 192 CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE UNGULATES. 1 : 10, or even flatter in very large rhombic plates; rarely in prismatic development with the above ratio 2:1. The crystals are normally twinned "horse-type twin" (text figures 110 and 111), with the two parts united along a prism-base edge and the axis of the hemitrope twin normal to this common edge and in the basal pinacoid, which is the ordinary composition plane. In some cases this composition plane is the plane normal to the base, that includes the common edge, or is the so-called plane of twinning, normal to the twin axis. In some crystals both of these composition planes occur in the same individual, by one crystal overgrowing the other, over the common edge; and the two uniting by filling up the re-entrant angle and forming the false plane normal to the base and in the zone of the prism-base. In some cases the two parts of the twin are normally developed crystals; but usually, when the base is the composition face, the two crystals become elongated in the direction of the common edge (text figure 110), and the ratio of length to breadth of such a crystal may be 6 : 1. Such crystals show the overlapping at each end and recall the arrangement of the Carlsbad twin. When the composition face is the twin plane, normal to the base, the two crystals may slightly overlap, or this may not be noticeable and they are simply juxtaposed along this plane, recalling the. a 112 FIGS. 108, 109, 110, 111, 112, 113. Equut caballut 0-Oxyhemoglobin. common gypsum twin on the orthopinacoid; and even becoming elongated along the common edge, but not to the same extent as in the case when the base is the composition face. Another hemitrope twin of this type is possible in which the twin axis is the com- mon prism-base edge and the composition face is the base or the normal to the base. This also appears to occur, but not so commonly. There is a third kind of twinning t
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