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~The Action of the Venom of Zchis carinatus. By Sir Thomas R. Fraser, M.D., 
LL.D., Se.D., F.R.S., Professor of Materia Medica, University of Edinburgh ; 
and James A. Gunn, M.A., M.D., D.Sc., Assistant in the Materia Medica 
Department, University of Edinburgh. (Abstract): ..........c0.cecsesessscoseveorenses 491 
No. B 567.—May 31, 1911. 
The Chemical Dynamics of Serum Reactions. By Captain A. G. McKendrick, 
I.M.S., Assistant Director, The Pasteur Institute of Southern India, Coonoor. 
Sommanicated by Sir James Dewar, FURS. .....c.cccssccsecescansacecssccsstoanedeesoas 493 
Further Researches on the Development of Trypanosoma gambiense in Glossina 
palpalis. By Colonel Sir David Bruce, C.B., F.R.S., A.M.S. ; Captains A. E. 
Hamerton, D.S.O., and H. R. Bateman, R.A.M.C. ; and Captain F. P. Mackie, 
I.M.S. (Sleeping Sickness Commission of the Royal Society, Uganda, 1908-10... 513 
Preliminary Note on a Method of Measuring Colour-sensations by Intermittent 
Light, with Description of an Unfinished Apparatus for the Purpose. By 
Ceence deeourchsAMTA, W5Sc.(OxOM), PARAS. cc wnssohestorctbesaentncs vos des iuessussnecs 528 
Spontaneous Cancer in Mice. By M. Haaland, M.D., Imperial Cancer Research 
Hund Communicated by Prof. J. Rose Bradford, Sec. B.S. .........0cceceseqeseres 532 
On Variation and Adaptation in Bacteria, Illustrated by Observations upon 
Streptococci, with Special Reference to the Value of Fermentation Tests as 
Applied to these Organisms. By E. W. Ainley Walker, M.A., D.M., Fellow 
and Tutor of University College, and Lecturer in Pathology in the University 
of Oxford. Communicated by Prof. Francis Gotch, F.R.S. ............cccceccecsceees 54] 
OBITUARY NOTICES OF FELLOWS DECEASED. 
Harry Marshall Ward ; Harry Govier Seeley ; Robert Koch ......:.........-.0.000 i—Xxiv 
