Scope and Contents 1 Plastic valve in valve-testing machine (circa 1958). 2 High speed photography of plastic valves. 3 High speed photography of normal dog valve. 4 Insertion of tricuspid polyurethane valve in the mitral orifice in a dog (circa 1958). 5 Defibrillation of the heart. 6 Similar dog after 35 days. 7 Angiocardiogram with injection of dye in the laboratory of Sones-Shirey. 8 Thrombosis on Teflon valves being peeled off...