1 I s. Roy, Soc. Edin. 



Vol. XLVII. 



C Thomas E. Fraser and Mr Alistbr T. Mackenzie on Strophanthus sarmentosus : its Pharmacological Action 



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



Fig. 1. — Before Strophanthus. 



Fig. 2. — Strophanthus perfused. 



Fig. 3. — After Strophanthus. 



Fig. 4. 



Fig. 5. 



Fig. 6. 



Fig. 11. 



Experiment LXII. — Frog-Heart Tracings. Extract of Strophanthus sarmentosus (1 in 60,000). Reads left to right. 



The upstroke represents systole ; the downstroke diastole. 



