PROCEEDINGS 



OF 



THE ROYAL SOCIETY, 

 s B. Vol. 85. No. I 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



Petrifactions of the Earliest European Angiosperms. By MARIE C. STOPES, 



D.Sc, Ph.D., F.L.S., Fellow of University College, London. (Abstract) . 249 



On the Instability of a Cortical Point. By T. GRAHAM BROWN and 



C. S. SHERRINGTON, F.R.S 250 



The Factors in Rhythmic Activity of the Nervous System. By T. GRAHAM 



BROWN (Carnegie Fellow) 278 



Reflex Rhythm Induced by Concurrent Excitation and Inhibition. By 



ALEXANDER FORBES, M.A., M.D., Harvard 289 



Antelope as a Reservoir for Trypanosoma gambiense. By H. L. DUKE . 299 



The Relation between Secretory and Capillary Pressure. I. — The Salivary 

 Secretion. By LEONARD HILL, F.R.S., and MARTIN FLACK (Eliza 

 Ann Alston Research Scholar) 3 12 



The Effects of Ultra-violet Rays upon the Eye. By Dr. E. K. MARTIN. 



(Plates 4— 7) 319 



printed for THE ROYAL SOCIETY and sold by 



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