Picture of valvulotome and heart showing where to make the incision, items identified, ""l. auricular appendage, L. coronary vessel, L. Phrenic n., V. ventricle, Pericardium, Totaling heart to fight by traction on pericardium, Pieura, incision in heart, R. vent., Valvulotome, open, closed"", drawing signed by L. Schlosoberg