^"^^^ PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



The Thyroid and Parathyroid Glands throughout Vertebrates. By 



F. D. THOMPSON. (Abstract) 389 



Tone Perception in Gammarus pulex. By F. J. COLE, B.Sc, Professor of 



Zoology, University College, Reading . . . . . . .391 



A Physiological Effect of an Alternating Magnetic Field. By SILVANUS 



P. THOMPSON, D.Sc, F.R.S 39^ 



On the Weight of Precipitate Obtainable in Precipitin Interactions. By 



Dr. H. G. CHAPMAN 398 



The Influence of Bacterial Endotoxins on Phagocytosis. (Preliminary 

 Report.) By LEONARD S. DUDGEON, P. N. PANTON. and H. A. F. 

 WILSON 406 



A Case of Sleeping Sickness Studied by Precise Enumerative Methods : 

 Regular Periodical Increase of the Parasites Disclosed. By Major 

 RONALD ROSS, F.R.S., and DAVID THOMSON, M.B.. Ch.B.. D.P.H. . 411 



On the Recognition of the Individual by Haemolytic Methods. (Preliminary 

 Communication.) By CHARLES TODD, M.D., Bacteriologist, Egyptian 

 Government, and R. G. WHITE, M.B., Director, Serum Institute, Cairo . 416 



Experimental Researches on Vegetable Assimilation and Respiration. VI. — • 

 Some Experiments on Assimilation in the Open Air. By D. THODAY, 

 M. A., Junior University Demonstrator in Botany, Cambridge . . ,421 



Receptors and Afferents of the Third, Fourth, and Sixth Cranial Nerves. 



By FRANCES M. TOZER, B.Sc. and C. S. SHERRINGTON, D.Sc. . . 450 



The Relation of Light Perception to Colour Perception. By F. W. 



EDRIDGE-GREEN, M.D., F.R.C.S., Beit Medical Research Fellow . . 458 



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