OF THE DOGS, WOLVES, AND FOXES. 271 



and from the clear solution thus obtained slide preparations were made as 

 usual. Crystallization proceeded rapidly after covering the slides, the 

 blood crystallizing more readily than that of the dog. The crystals were 

 small, but gradually increased in size and showed no tendency to dissolve 

 for several days. Finally, however, they did dissolve in the plasma. They 

 were oxyhemoglobin. 



Oxyhemoglobin of Cam's latrans. 



Orthorhombic : Axial ratio a : b : 6 =1 : 0.4254, from (504). 



Forms observed: Prism, probably (110), macrodome (504). 



Angles: The only angle obtained satisfactorily was that of the macrodome (504) = 

 56. The prism angle was not observed in measurable position. From (504) the angle 

 101 A 101 =46 5' was calculated. 



Habit of the crystals at first comparatively short capillary, elongated on the prism 

 and terminated by a dome which appears to be (504). Later, the crystals along the 

 protein ring and the cover edge, as well as scattered crystals throughout the body of the 

 slide, became thicker, without increase of length, until the ratio of length to thickness 

 was about 5 : 1 (text figure 304) ; whereas in the capillary crystals at first developed 

 this ratio was 200 : 1 or more. The larger crystals show very distinctly the striated 

 character, parallel to the length, that is common in the genus Cam's, and this is evidently 

 due, as usual, to parallel growth on the vertical axis. The capillary crystals form dense 

 felted masses throughout the slide, or grow in spherulitic tufts, radiating from a common 

 center. The larger crystals are much shorter than is common in the dog tribe, but 

 they were never so thick as is common with most of the dogs. It is evident that the 

 oxyhemoglobin is more insoluble than is usual in this genus, and this fact would account 

 for the differences noted. 



Pleochroism is marked and double refraction strong. The colors are : a pale yel- 

 lowish-red, b deeper red, c deep red. Extinction is straight in all aspects seen; no cross- 

 sections of the prism were observed. The interference figure was not observed. The 

 orientation of the elasticity axes appears to be a=a, b = b, c = 6 as usual. The axis 

 of greatest elasticity is probably the acute bisectrix, Bx a = a, which would make the 

 optical character negative. 



JACKAL, Carat's aureus. Plate 75. 



The specimen was received from the National Zoological Park at 

 Washington, District of Columbia, and was not putrid, but had the color 

 of stale blood. The blood was oxalated, frozen and thawed, ether-laked, 

 and centrifugalized for several hours, and from the clear solution thus 

 obtained the usual slide preparations were made. The blood crystallized 

 very readily and the crystals appeared to be rather insoluble, showing no 

 tendency to dissolve in the solution. Inside of a few hours the crystals 

 had reached measurable dimensions, and after 24 hours many of them were 

 quite large. They formed at first along the protein ring and the cover 

 edge, but soon the entire body of the slide became filled with crystals, and 

 deposition continued until the solution was nearly colorless. The crystals 

 were oxyhemoglobin. 



Oxyhemoglobin of Cam's aureus. 



Orthorhombic: Axial ratio a: 6 =1 : 0.4245. 



Forms observed: Prism, probably the unit prism (110), macrodome (101). 



Angles: The only angle that was satisfactorily determined was that of the macro- 

 dome, 101 A 101 =46. The prism angle was not made out. 



