Smithsonian Report, 1955. — Griffenhagen and Hughes 



Plate 3 



1. Dale-Schuster double perfusion pump, made by C. F. Palmer, Ltd., of England, and pro- 

 posed by Dale and Schuster in 1928 for use as a mechanical heart. 



2. Gibbon heart-lung machine, used in 1937 for the first successful mechanical substitution 

 of both the heart and lungs of an animal. 



