216 



CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE UNGULATES. 



Habit very long lath-shaped, elongated on the vertical axis and flattened on the 

 macropinacoid, which is the only plane of any size on the crystal (text figure 178) ; the 

 brachypinacoid and brachydome are both very narrow. The crystals are often terminated 

 by one plane of the brachydome only, the other being wanting or very small. Some 

 crystals are simply acicular, with a long tapering point, as is common in imperfectly 

 developed crystals. 



Pleochroism strong, but only observed on the flat view or on the macropinacoid 

 with any exactness. Probably this is the plane of the optic axes, as in the bullock. 

 Assuming this to be the case, the pleochroism is: a nearly colorless, c deep red. The 

 orientation of the axes on this basis would be a =6, b=a (not exactly observed), c = (5. 

 No interference figure was observed, and the optical character can not be fixed without 

 further data. The pleochroism indicates that it is negative. 



TABLE 41. Crystallographic characters of the hemoglobins of the Ungulata. 



* True angles. 



