PROCEEDINGS 



OF 



THE ROYAL SOCIETY 



Series B. Vol. 93. No. B 652. 



BIOLOGICAL SCIENCES 



APRia 1922 



CONTENTS. 



Page 



On the Development and Morphology of the Leaves of Palms. By 

 A. ARBER, D.Sc, F.L.S., Keddey Fletcher- Warr Student of the 

 University of London . . . . . . . . . . 2 49 



Studies in the Fat Metabolism of the Timothy Grass Bacillus. By 

 M. STEPHENSON, Beit Memorial Research Fellow, and M. D. 

 WHETHAM 262 



Recoil Curves as Shown by the Hot- Wire Microphone. By Lieut -Colonel 

 C. B. HEALD, C.B.E., M.D., and Major W. S. TUCKER, R.E., D.Sc. 

 (Plates 5-8) . . . -. - 281 



The Velocity of the Pulse Wave in Man. By J. C. BRAMWELL, M.B., 



M.R.C.R, and A. V. HILL, F.R.S 298 



PRINTED AND PUBLISHED FOR THE ROYAL SOCIETY BY 

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



Price Three Shillings. 



No. B 652. 



April 1, 1922. 



