Scope and Contents 1 High-speed photography of artificial valve in operation; peeling away of thrombi from Teflon heart valves, including a monocusp valve. 2 Angiogram of valve in operation. 3 Polyurethane monocusp after eight days. 4 Examination of atrioventricular patch; collagen and atrioventricular patch; Teflon. 5 Silastic valve after eleven days. 6 Silastic atrioventricular patch after eight days. 7 Examination of fibrinolysin and...