i 1 s. Roy. Soc. Edin. 



Vol. XLVII. 



Thomas R. Fraser and Mr Alister T. Mackenzie on Strophanthus surmentosus : its Pharmacological Action 



and its Use as an Arrow-poison. — Plate VII. 



Fig. 1.— Before Strophanthus. 



Fig. 2. — Strophanthus perfused. 



Fig. 3. — After Strophanthus. 



Fig. 5 



periment LXIII.— Fkog-Heart Tracings. Extract of Strophanthus sarmentosus (1 in 20,000). Reads left to right. The upstroke 



represents systole ; the downstroke diastole. 



