Tr ft. Roy. Soc. Edin. 



Vol. XLVII. 



Thomas K. Frasbr and Mr Alister T. Mackenzie on Strophanthus sarmentosus : its Pharmacological Action 



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



Fig. 1. — Before Strophanthus. 



Fig. 2. — Strophanthus perfused (1 in a million). 



fl/l /I /I fl A/I /I 



wuuuiyuuui/u 



/I l\ /! I\ A l\ H t\ 



Fig. 4. 



Fig. 6. 



Fig. 7. 



Fig. S. 



E3 



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



represents systole ; the downstroke diastole, 



Fig. 11. 



Fig. 10. 



Fig. 12. 



