PLATE 13 



74 



73. Oxyhemoglubin of the Pigeon (Columba livia), showing comparatively simple twinned aggregate, 



in the basal aspect. 

 74, 75. Same, showing more complex aggregates, some on edge or inclined. 



76. Metoxyhemoglobin and Oxyhemoglohin of the Pigeon, showing disintegration of oxyhemoglobin 



crystals as metoxyhemoglobin crystals develop. 



77, 78. Metoxyhemoglobin and Reduced Hemoglobin of the Pigeon, showing the needle-like crystals of 

 reduced hemoglobin growing in tufts from crystals of metoxyhemoglobin. 



