PROCEEDINGS 



OF . ( DEC2?1921 



THE ROYAL SOCIETY.^-S^^if?^^ 



Series B. Vol. 92. No. B 648. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



Observations on Reflex Responses to Rhythmical Stimulation in the Frog. 



By K. SASSA. M.D.. Tokio 328 



On the Effects of Constant Galvanic Currents upon the Mammalian Nerve- 

 Muscle and Reflex Preparations. By K. SASSA, M.D., Tokio . . 341 



On the Longevity of certain Species of Yeast. By A. R. LING and 



D. R. NANJI . . . .355 



On the Origin and Destifty of Cholesterol in the Animal Organism. 

 Part XII.— On the Excretion of Sterols in Man. By J. A. GARDNER 

 and F. W. FOX (Beit Memorial Fellow) . . . . . . 358" 



A Quantitative Analysis of the Growth of Helianthus annuus. Part I. — 

 The Respiration of the Plant and of its Parts throughout the Life Cycle. 

 By F. KIDD, C. WEST (Research Workers, Food Investigation Board), 

 and G. E. BRIGGS (Demonstrator in Plant Physiology, Botany School, 

 Cambridge) 368- 



Idio- Ventricular Periodicity. By D. H. DE SOUZA and J. A. HEWITT . 385 



Index . . . . . . . . ... . . xlvii 



Title, Contents, etc. 



PRINTED AND PUBLISHED FOR THE ROYAL SOCIETY BY 

 HARRISON & SONS, Ltd., 44-47, ST. MARTIN'S LANE, LONDON. W.C.2. 



Price Four Shillings. 



No. B 648. 



December 1, 1921, 



