OF THE DOGS, WOLVES, AND FOXES. 



275 



after the slides were prepared. No difference in form or optical characters 

 was observed between the crystals of oxyhemoglobin and the paramorphs 

 of reduced hemoglobin. 



Oxyhemoglobin of Vulpes vulpes. 



Orthorhombic: Axial ratio a : <J =1 : 0.4245. 



Forms observed: Unit prism (110), macrodome (101). 



Angles: The prism angle could not be observed as no cross-sections were seen. A 

 fair measurement of the macrodome angle gave 101 A T01 =46. 



Habit long prismatic on the vertical axis, the crystals ranging from long hairs, 

 1,000 times as long as thick, to more nearly normal crystals with the ratio of length to 

 thickness varying from 40 : 1 to 15 : 1 (text figure 310). The larger crystals are verti- 

 cally striated along the length, due to parallel growth; but they appear to grow together 

 on the prism planes as well as on the brachypinacoid, so that the composite crystals, 

 produced by parallel growth, are not so flattened on the macropinacoid as they often are 

 in this genus. The hair-like crystals grow throughout the body of the slide and form 

 felted masses of hairs, but do not grow in the spherulitic and radiating tufts, as is usual 

 in this genus. The larger crystals grow in parallel groups, rather than radiating, and the 

 tufts of crystals thus formed are only slightly divergent. Twins were not observed. 



Pleochroism was noticeable, the double refraction was distinct and extinction 

 straight in all aspects. The orientation of the elasticity axes appears to be as usual in 

 the dogs, a = a, 6=6, c=<!. The optical character is probably negative. 



310 



'312 



314 



311 



Fio. 310. Vulpes vulpes Oxyhemoglobin. Flos. 311, 312, 313, 314. Vulpet fulvut Oxyhemoglobin. 



RED Fox, Vulpes fulvus. Plate 77. 



Examination was made of two specimens, both of fresh blood, the first 

 specimen being obtained from a zoological garden and the second by 

 purchase of the living animal from a collector. The first specimen was 

 oxalated and repeatedly frozen and thawed and then ether-laked and 

 centrifugalized ; and from the clear solution the slides were prepared. The 

 crystals obtained in this series of preparations were rather more perfect 

 than those obtained by either of the other methods of preparation used. 

 The blood from the second specimen was treated in several ways: (a) The 

 whole blood was oxalated and ether-laked as in the regular method of 

 preparation, (6) the corpuscles were centrifugalized and a mixture of three- 

 fourths plasma and one-fourth corpuscles was oxalated and ether-laked; 



