Contents

25 February 1972
Vol 175, Issue 4024

About The Cover

Embryonic chick heart cells (tryspin disaggregated) were growth oriented in tissue culture for 8 days and formed a ``heart''-shaped, synthetic strand of cardiac muscle. The preparation was fixed in Bouin's fluid and stained with phosphotungstic acidhematoxylin (about X 6.8). See page 909. [Thurman Ellis, Duke University Medical Center, Durham, North Carolona]