246 



CRYSTALLOGRAPHY OF HEMOGLOBINS OF THE RODENTIA. 



the optical character was negative. The orientation of the elasticity axes is apparently 

 a A 6 = 15; b=b; c A a = 10 in the acute angle (approximately), the angle j9 not being 

 exactly determined, but assumed to be 85, as in the common rabbit. The plane of the 

 optic axes appears to be normal to what it is in case of the common domestic rabbit, 

 being in the case of the Belgian hare the plane of symmetry, and in the rabbit normal 

 to the plane of symmetry. In other words, c and b change places in the Belgian-hare 

 crystals from what they are in the rabbit. 



p-Oxyhemoglobin of Lepus europceus. 



Orthorhombic : Axial ratio a : b : 6 = 1 : b : 1.376. 



Forms observed: Unit prism (110), brachyclome (Oil), brachypinacoid (010), 

 macrodome (101), unit pyramid (111) (?). 



Angles: Macrodome angle Oil A Oil =72 actual angle. 



Habit tabular on the brachypinacoid; the development of the faces very irregular, 

 producing a monoclinic habit (text figure 225) ; but the extinction straight in all aspects 

 and hence probably only pseudomonoclinic. The crystals were sometimes regularly 

 developed, and in some crystals only one or two unsymmetrical planes appeared. The 

 tabular crystal, flattened on the brachypinacoid, is bounded by the macrodome and 

 prism in some of the crystals examined; in others, one pair of faces of the macrodome 

 only appear or one pair of faces of the unit prism, producing the monoclinic habit noted 

 above. The crystals melted so rapidly that measurements were incomplete. 



Pleochroic colors are shades of rose-pink or rose-red; a colorless, b deep rose-pink, 

 c deep red. 



TABLE 42. Crystallographic characters of the hemoglobins of the Rodentia. 



* True angle of traces of prism on base. 



