OF THE CATS AND CIVETS. 



291 



solution, and all look somewhat soft and porous. They occurred sparingly, scattered 

 singly or in small groups through the slides. 



Color scarlet, no pleochroism and apparently no double refraction. As the crystals 

 have a definitively tetragonal aspect and angles, this absence of double refraction is 

 very likely due to mimetic twinning. The angle of 54 50' and near 55 is a common 

 dome angle in the cats. An interpenetrant twin showing this dome angle only and twinned 

 on the macrodome would produce the effect. The macro-axis is the axis of mean elas- 

 ticity b and the others a and c would neutralize each other and the resultant would 

 about equal b, so that double refraction would disappear. 



. 



334 



336 



337 



FIGS. 334, 335. Felis bengalensis Reduced Hemoglobin. Fia. 336. Felis bengalensi* Oxy hemoglobin. 

 FIG. 337. Felii pardalis Reduced Hemoglobin. 



OCELOT, Felis pardalis. Plate 88. 



The specimen was received from the National Zoological Park at 

 Washington, District of Columbia, during the summer, and was kept frozen 

 in the refrigerating plant until examined in the following winter. When 

 thawed, the blood was found to be full of clots and amorphous matter and 

 quite putrid. The freezing having laked the blood, the mixture was diluted 

 with water and centrifugalized to separate the impurities, and the aqueous 

 solution thus obtained was evaporated until sufficiently concentrated for 

 good preparations, when the slides were prepared in the usual manner. 

 The blood crystallized very readily at room temperature, and, inside of 2 

 hours after the slides were covered, satisfactory photographs were obtained 

 of the crystals. The crystals showed no tendency to dissolve on keeping, 

 and they remained in good condition for a considerable time. Only crystals 

 of reduced hemoglobin were made from this blood. 



Reduced Hemoglobin of Felis pardalis. 



Orthorhombic: a : b : 6 =0.9489 : 1 : 0.3931. 



Forms observed: Unit prism (110), macrodome (101), macropinacoid (100). 



Angles: Prism angle 110 A 110=87; macrodome 101 A 101=45. 



Habit long prismatic on the vertical axis, the crystal consisting of the unit prism, 

 and generally the macropinacoid in the prismatic zone, and terminated by the macro- 

 dome (text figure 337). The crystals are much longer in proportion to the thickness 

 than is common with the cats; in this species, the ratio of length to thickness is from 

 15 : 1 to 20 : 1. These ratios apply to the crystals after 24 hours; those that form first 

 are shorter with a ratio of length to thickness of about 8:1. The first crystals to form 

 do not show the macropinacoid; this appears on the larger crystals later. The slides 



