PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 92, No. B 646. 



BIOLOGICAL SCIENCES. 



CONTENTS. V 



V Page 



A Quantum Theory of Colour Vision. By J. JOLY. Sc.D., F.R.S. , . 219^ 



The Effect of Red Fatigue on the White Equation. By F. W. EDRIDGE- 

 GREEN. C.B.E.. M.D.. F.R.C.S.. Special Examiner and Adviser to the 

 Board of Trade on Colour Vision and Eyesight . . . . .232 



Dictyokinesis in Germ Cells, or the Distribution of the Golgi Apparatus 

 during Cell Division. By R. J. LUDFORD, B.Sc (Lond). and 

 J. B. GATENBY. B.A.. B.Sc, D.Phil. (Oxon.). (Plates 17 and 18) . . 235 



Break-shock Reflexes and " Supramaximal " Contraction -response of Mam- 

 malian Nerve-muscle to Single Shock Stimuli. By C. S. SHERRINGTON, 

 M.D., Pres. R.S 245 



Obituary Notices of Fellows deceased : — Charles Lapworth (with portrait) ; 



Leonard Doncaster (with portrait) xxxi — xlvi 



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 646. 



July 1, 1921. 



