316 CRYSTALLOGRAPHY OF THE HEMOGLOBINS 



the two brushes are observed, widely separated; the angle 2E was measured as 105. 

 The acute bisectrix is evidently the axis of least elasticity, in spite of the indications of 

 the pleochroism, Bx a = c, and the optical character is hence positive. 



ft-Methemoglobin of Papio porcarius. 



Monoclinic: Axial ratio a : 6 : <* =1.720 : 1 : 6; /3 = 72 30'. 



Forms observed: Unit prism (110), base (001). 



Angles: Prism angle, traces of prism on base, edges 110-001 A 110-001=60 20'; 

 prism edge to base, edge 110-110 A 001 =72 30' =0. 



Habit the same as that for the /?-oxyhemoglobin, of which it may be a paramorph, 

 but the angles appear to be slightly different. The optical characters differ from those 

 of the /?-oxyhemoglobin mainly in the colors and in the orientation of the elasticity axes. 

 Pleochroism is strong; a is nearly colorless, pale yellowish; 6 and c are nearly alike and 

 deep brown, the absorption of c being greater than that of 6. The double refraction is 

 strong. The orientation of the elasticity axes (text figures 398 and 399) is a A a = 15, 

 in the acute angle; b=6; c A <!=32 30' in the obtuse angle. The interference figure is 

 seen on the basal section, with one brush showing, and unsymmetrical. The angle be- 

 tween the optic axes was measured as about 80 = 2E. The acute bisectrix of the optic axes 

 is evidently the axis of least elasticity, Bx a =c, and the optical character is hence positive. 



ANUBIS BABOON, Papio anubis. Plate 100. 



The specimen of blood was received from the National Zoological Park 

 at Washington, District of Columbia, and was putrid and clotted. The clot 

 was ground in sand, etherized and centrifugalized, yielding a clear solution 

 from which the slide preparations were made. Inside of 24 hours the crys- 

 tals were sufficiently well developed to photograph. The first crystals to form 

 were the usual monoclinic type of the baboons, /^-oxyhemoglobin ; and later, 

 as a second crop, the y-oxyhemoglobin appeared. The a-oxyhemoglobin, 

 which was observed in Papio babuin, P. langheldi, P. porcarius, etc., did 

 not make its appearance in this specimen. Only crystals of oxyhemoglobin 

 were observed, no reduced hemoglobin or methemoglobin crystals developed. 



400 



F:os. 400, 401, 402, 403, 404, 405. Papio onufti. fl-Oxyhemoglobin. 



^-Oxyhemoglobin of Papio anubis. 



Monoclinic: Axial ratio 1.737 : 1 : 6; /3=71 30'. 



Forms observed: Prism (110), orthopinacoid (100), base (001). 



Angles: Prism angle, traces of prism on base, edges 110-001 A lTO-001 =59 49', 

 average; prism edge to base or angle /? = 71 30'. 



Habit of crystals thin to thick tabular or prismatic; the smaller crystals are usually 

 prismatic with a length on 6 equal to 2a (text figure 400) or even longer; the larger 

 crystals are usually rather thick tabular with a thickness, in the direction of 6, of one- 

 fourth of a (text figures 401 and 402). But many of the larger crystals are well developed 

 in the prismatic zone. The usual crystal is the prism-base combination; and, in the pris- 

 matic habit of crystal, these are the only forms present; but, in the tabular type, the 

 orthopinacoid (100) is frequently present also (text figure 403), usually with one of its faces 



