PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 85. 



No. B 581. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



The Chemical Action on Glucose of a Variety of Bacillus coli communis 

 (Escherich), obtained by Cultivation in Presence of a Chloroacetate. 

 (Preliminary Notice.) By A. HARDEN, F.R.S.. and W. J. PENFOLD . 415 

 The Action of Enzymes on Hexosephosphate. By VICTOR J. HARDING . 4'8 

 The Morphology of the Trypanosome Causing Disease in Man in Nyasaland. 

 By Colonel Sir DAVID BRUCE. C.B., F.R.S., A.M.S. ; Majors DAVID 

 HARVEY and A. E. HAMERTON. D.S.O., R.A.M.C. ; Dr. J. B. DAVEY. 

 Nyasaland Medical Staff ; and Lady BRUCE, R.R.C. (Plates 1 1 and 12) 423 

 Negative After-images and Successive Contrast with Pure Spectral Colours. 

 By A. W. PORTER, B.Sc , F.R.S., Fellow of University of London, 

 University College, and F. W. EDRIDGE-GREEN, M.D., F.R.C.S., Beit 



Memorial Research Fellow 434 



The Relation between Capillary Pressure and Secretion. II. — The 

 Secretion of the Aqueous and the Intraocular Pressure. By LEONARD 

 HILL, F.R.S., and MARTIN FLACK (Eliza Ann Alston Research Scholar) 439 

 The Oxydases of Cytisus Adami. By FREDERICK KEEBLE, Sc.D., 

 Professor of Botany, University College, Reading, and E. FRANKLAND 



ARMSTRONG, Ph.D., D.Sc 460 



Some Conditions Influencing Nitrogen Fixation by Aerobic Organisms. By 



W. B. BOTTOMLEY, M.A., Professor of Botany, King's College, London . 466 

 The Intensity of Natural Selection in Man. By KARL PEARSON, F.R.S. . 469 

 The Morphology of Trypanosoma simiae, sp. nov. By Colonel Sir DAVID 

 BRUCE, C.B., F.R.S., A.M.S. ; Majors DAVID HARVEY and A. E. 

 HAMERTON, D.S.O., R.A.M.C. ; Dr. J. B. DAVEY, Nyasaland Medical 

 Staff ; and Lady BRUCE, R R C. (Scientific Commission of the Royal 



Society, Nyasaland, 1911-12.) (Plate 13) 477 



The Cultivation of Trypanosoma rhodesiense, Stephens and Fantham. By 

 H. BAYON, M.D., Genoa and Wiirzburg, Beit Memorial Research 

 Fellow, Lister Institute ......... 482 



Further Observations on the Recovery of Trypanosoma gambiense from 

 Tragelaphus spekei on the Islands of Lake Victoria Nyanza. By Dr. 



H. L. DUKE 



printed for THE ROYAL SOCIETY and sold by 



HARRISON & SONS, 45, ST. MARTIN'S LANE, LONDON. W.C. 



Price Four Shillings. 



No. B 581. 



August 24, 1912. 



