PLATE 70 



419 



420 



41."). Oxyhemoglobin of the Bl:ick Bear (I'rxux americanus), showing large cnstals along nner edge. 



mostly in section. 

 116. Same, showing two large groups of crystals along cover edge in |i:inillel orientation, diviileil liy 



large crystals in oblique section. 

 417, 41S. Oxyhemoglobin of the Polar Bear (I.' runs inari/iiinix), showing small. first-fornn-il ci\>l:ils (\\iimeil 



in bear-type twin, growing in protein ring. 



419. Same, single crystals showing hemimorphisrn ami bear-type twins, near COMT edge. 



420. Same, larger tabular crystals along cover edge, showing parallel growl h. 



