Contents

20 April 1973
Vol 180, Issue 4083

About The Cover

Preserved red blood cells, showing characteristic bioconcavity, in a thoracic vein. The dark granules are autolyzed leukocytes. (Hematoxylin and eosinstain, about X 1400). See page 303. [Michael R. Zimmeraman, Hospital of the University of Pennsylvania, Philadelphia]