iv 



No. B 569.— July 20, 1911. 



PAGE 



The Properties of Colloidal Systems. — II. On Adsorption as ^Preliminary to 

 Chemical Reaction. By W. M. Bayliss, F.R.S., Institute of Physiology, 

 University College, London 81 



On the Distribution and Action of Soluble Substances in Frogs Deprived of their 

 Circulatory Apparatus. By S. J. Meltzer, New York. Communicated by 

 Prof. A. R. Cushny, F.E.S 98 



The Mechanism of Carbon Assimilation : Part III. By Francis L. Usher and 



J. H. Priestley. Communicated by Dr. M. W. Travers, F.E.S 101 



Transmission of Amakebe by means of Rhipicephalus appendiculatus, the Brown 

 Tick. By Dr. A. Theiler, C.M.G., Pretoria. Communicated by Colonel Sir D. 

 Bruce, C.B., F.E.S 112 



The Discrimination of Colour. By F. W. Edridge-Green, M.D., F.E.C.S., Beit 



Medical Eesearch Fellow. Communicated by Prof. W. M. Bayliss, F.E.S 11G 



Note on the Sensibility of the Eye to Variations of Wave-length. By W. Watson, 



D.Sc, F.E.S 118 



On the Direct Guaiacum Eeaction given by Plant Extracts. By Miss M. Wheldale, 

 Fellow of Newnham College, Cambridge. Communicated by W. Bateson, 

 F.R.S 121 



The Action of Eadium Eadiations upon Some of the Main Constituents of Normal 

 Blood. By Helen Chambers, M.D., and S. Euss, D.Sc, Beit Memorial Eesearch 

 Fellow. Communicated by Dr. J. E. Bradford, Sec. E.S 124 



On a New Method of Estimating the Aperture of Stomata. By Francis Darwin, 



F.E.S., and D. F. M. Pertz 136 



No. B 570.— August 18, 1911. 

 The Experimental Transmission of Goitre from Man to Animals. By Eobert 

 McCarrison, M.D., M.E.C.P. (Lond.), Captain, Indian Medical Service; Agency 

 Surgeon, Gilgit, Kashmere. Communicated by Major Eonald Eoss, C.B., F.E.S. 

 (Plate 1*) 155 



The Pathogenic Agent in a Case of Human Trypanosomiasis in Nyasaland. By 

 Hugh S. Stannus and Warrington Yorke. Communicated by Major E. Eoss, 

 F.E.S. (Plate 2) 156 



Note on Developmental Forms of Trypanosoma brucei (pecaudi)\ in the Internal 

 Organs, Axillary Glands, and Bone-marrow of the Gerbil (Gerbillus pygargus). 

 By George Buchanan, Senior Laboratory Assistant, Wellcome Tropical Eesearch 

 Laboratories, Gordon College, Khartoum. Communicated by Col. Sir David 

 Bruce, C.B., F.E.S. (Plate 3) 161 



A Contribution to our Knowledge of the Protozoa of the Soil. By T. Goodey, M.Sc. 

 (Birm.), Mackinnon Student of the Eoyal Society, Eothamsted Experimental 

 Station. Communicated by A. D. Hall, F.E.S. (Plate 4) 165 



The Morphology of Trypanosoma evansi (Steel). By Colonel Sir David Bruce, C.B., 



F.E.S., Army Medical Service. (Plate 5) 181 



