162 



CRYSTALLOGRAPHY OF THE HEMOGLOBINS OF AVES. 



were made. After 48 hours at near a freezing temperature crystals appeared 

 in one of the slides; they appeared to be reduced hemoglobin, but the 

 deep-colored solution prevented spectroscopic determination. Later they 

 improved somewhat and then appeared to be methemoglobin. They were 

 very small too small for obtaining an interference figure. They did not 

 appear to dissolve readily when once formed, although they formed very 

 slowly. 



Methemoglobin (?) of Struthio camelus. 



Orthorhombic : Axial ratio a : b : 6 =0.5658 : 1 : 6. 



Forms observed: Prism (110), base (001). 



Angles: 110 A 110=59 (normals); 110 A 001 =90. 



Habit in small rhombic tables, very thin (text figures 31 and 32); occurring singly 

 and not twinned, as is common in these rhombic plates. 



Pleochroism rather strong; a colorless, b yellowish-red, c deep red. Extinction 

 was straight on all edge views and symmetrical on the base. Orientation of the elasticity 

 axes is a =6, b=a, c=c l ; plane of the optic axes is the macropinacoid. No interference 

 figure could be obseved. 



CASSOWARY, Casuarius galeatus. Plate 8. 



The specimen was received from the National Zoological Park at 

 Washington, District of Columbia. The blood was in the form of a small 

 clot and was somewhat decomposed. Owing to the small quantity, it was 



only treated with ether 

 to lake it, but it was 

 at once converted into a 

 jelly. After being ex- 

 posed to temperatures 

 ranging above and below 

 the freezing-point for 24 

 hours, some fluid was ob- 

 tained and 5 slides were 

 prepared. The crystals 

 formed gradually, but 

 >J 3-1 were very poor. They 



did not appear to be very 

 soluble. The spectro- 

 scope showed a mixture 

 of oxyhemoglobin and 



methemoglobin in the serum, and the crystals were rather brownish-red, 

 but probably were oxyhemoglobin. The serum was highly colored, and 

 photographs were obtained with some difficulty. The crystals formed 

 mainly along the edge of the cover-glass. 



Oxyhemoglobin of Casuarius galeatus. 



Monoclinic: Axial ratio not determined, /? = 64 30'. 



Forms observed: Clinopinacoid (010), orthopinacoid (100), and clinodome (Oil). 



Angles: 010 A 100=90; 100 A edge of Oil =a A ci=/? = 64 30'. 



The angle of the dome was not satisfactorily measured. 



a/, 



Q! 



"~ 0_ 



FIGS. 31, 32. Struthw camelus Methemoglobiii. 

 FIGS. 33, 34. Casuarius galeatus Oxyhemoglobin. 



