HEMOGLOBIN 



137 



lines D, which is the sodium band in the yellow, and E, see the frontispiece, 

 one in the yellow, with its middle line some little way to the right of D. This 

 band is very intense, but narrower than the other, which lies in the green 

 near to the left of E. Each band is darkest in the middle and fades away 





FIG. 119. Crystals of Oxyhemoglobin 

 Prismatic, from Human Blood. 



FIG. 120. Oxyhemoglobin Crystals 

 Tetrahedral, from Blood of the Guinea-pig. 



at the sides. As the strength of the solution increases, the bands become 

 broader and deeper. Both the red and the blue ends of the spectrum be- 

 come encroached upon until the bands coalesce to form one very broad band 

 when only a slight amount of the green and part of the red remain unab- 



FIG. 121. Hexagonal Oxyhemoglobin Crystals, from Blood of Squirrel. On these 

 hexagonal plates prismatic crystals, grouped in a stellate manner, not unfrequently occur 

 (after Funke). 



sorbed. Any further increase of strength leads to complete absorption of 

 the spectrum. 



If crystals of hemoglobin are exposed to an atmosphere of oxygen they 

 take up oxgyen and form Oxyhemoglobin, each gram of the pigment fixing 



