658 EISEN. [Vol. XV. 



ment is to prevent a blocking of the capillaries and to cause an 

 increase of speed in the travel of the long erythrocytes through 

 them. The rounder erythrocytes do not require this loading 

 of the poles, as their shape would not interfere with their 

 movements in the capillaries. 



Biological Laboratory, 



California Academy of Sciences, 



San Francisco, November 11, 1897. 



