ACTION OF THE EXCISED MAMMALIAN HEART. 
131 
Wave (?) of contraction in ventricle of Cat’s excised heart, beating spontaneously, 2 minutes post 
mortem. The vertical lines r, r indicate corresponding positions of levers, that resting on the 
apex being’ a little in advance of that resting on the base. 
Tracing 13. 
Spontaneous contraction of Cat’s heart, recorded by double lever, 3 minutes post mortem. The 
movement of the lever resting on the apex precedes that of the lever resting on the base. The 
vertical lines r, r mark correspondence of levers. 
