Tit t. Roy. Soc. Edin. 



Vol. XLVII. 



S Thomas R. Fraser and Mr Alistbr T. Mackenzie on Strophanthus sarmentosus : its Pharmacological Action 



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



Fig. 3. 



Fig. 4. 



Fig. 5. 



Fig. 6. 



E3ERIMENT 



aaiBB5SBBBBBB5BBBSSSBS 



Fig. 7. 



LXI. — Frog-Heart Tracings. Extract of Strophanthus sarmentosus (1 in 200,000). Reads left to right. The upstroke 



represents systole ; the downstroke diastole. 



