PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 

 Series B. Vol. 92, No. B 645. 



BIOLOGICAL SCIENCES. 



^^N21 192 



CONTENTS. 



A Remarkable Flint Implement from Selsey Bill. 

 LANKESTER, K.C.B., F.R.S. (Plates 8-11) . 



Library^. 



Page 



By Sir RAY 



Reversal of Asymmetry in the Plutei of Echinus miliaris. By HIROSHI 

 OHSHIMA, Kyushiu Imperial University, Fukuoka, Japan 



The Energy Involved in the Electric Change in Muscle and Nerve, By 

 A. V. HILL. F.R.S ^ . 



CROONIAN LECTURE :— Release of Function in the Nervous 

 System. By H. HEAD, M.D.. F.R.S. 



Preliminary Report of the Mackie Ethnological Expedition to Central 

 Africa. By the Rev. J. ROSCOE. (Plates 12-16) . . . . 



162 



168 



178 



184 



209 



PRINTED AND PUBLISHED FOR THE ROYAL SOCIETY BY 

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



Price Four Shillings and Sixpence. 



No. B 645. 



June 1, 1921. 



