PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 90, 



No. B 629. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



Brevity, Frequency of Rhythm, and Amount of Reflex Nervous Discharge, 

 as indicated by Reflex Contractions. By N, B. DREYER and C. S. 

 SHERRINGTON, F.R.S. 270 



CROONI AN LECTURE.— The Physiological Basis of Thirst. By Major 

 WALTER R. CANNON, M.R.C., U.S. Army ; George Higginson Professor 

 of . Physiology, Harvard University ....... 283 



The Mechanism and Control of Fibrillation in the Mammalian Heart. By 



J. A. MacWILLIAM, F.R.S 302 



PRINTED AND PUBLISHED FOR THE ROYAL SOCIETY BY 

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

 Price Three Shillings. 



No. B 629. 



Ociober 17, 1918. 



