Tra Roy. Soc. Edin. 



Vol. XLVII. 



SiJCHOMAS R. Fraser and Mr Alister T. Mackenzie on Strophanthus sarmentosus : its Pharmacological Action 



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



Fig. 5. 



jXikiment LXIV. — Frog-Ventricle Tracings. Extract of Strophanthus sarmentosus (1 in 20,000). Reads left to right. The 



upstroke represents systole ; the downstroke diastole. 



