No. 438. 



Page 



On the Spectroscopic Examination of Colour produced by Simultaneous 

 Contrast. By George J. Burch, M.A., Reading College, Reading. 

 Communicated by Francis Gotch, F.R.S., Professor of Physiology, 

 University of Oxford 226 



An Experimental Investigation into the Flow of Marble. By Frank 

 D. Adams, M.Sc., Ph.D., Professor of Geology in McGill University, 

 Montreal, and John T. Nicolson, D.Sc., M.Inst.C.E., Head of the 

 Engineering Department, Municipal Technical School, Manchester. 

 Communicated by Professor H. L. Callendar, F.R.S 228 



Lines of Induction in a Magnetic Field. By H. S. Hele-Shaw, F.R.S. , 

 and A. Hay, B.Sc '. 234 



The Distribution of Molecular Energy. By J. H. Jeans, Scholar of 

 Trinity College, and Isaac Newton Student in the University of 

 Cambridge. Communicated by Professor J. J. Thomson, F.RS 236 



On the Capacity for Heat of Water between the Freezing and Boiling 

 Points, together with a Determination of the Mechanical Equivalent 

 of Heat in Terms of the International Electrical Units. Experi- 

 ments by the Continuous-flow Method of Calorimetry performed in 

 the Macdonald Physical Laboratory of McGill University, Montreal. 

 By Howard Turner Barnes, M.A.Sc., Joule Student. Communicated 

 by Professor H. L. Callendar, F.RS 238 



Energy of ROntgen and Becquerel Rays, and the Energy required to 

 produce an Ion in Gases. By E. Rutherford, M.A., B.Sc., Mac- 

 donald Professor of Physics, and R. K. McClung, B.A., Demonstra- 

 tor in Physics, McGill University, Montreal. Communicated by 



Professor J. J. Thomson, F.R.S. ..." 245 



On Expressed Yeast-cell Plasma (Buclmer's " Zymase''). By Allan 

 Macfadyen, M.D., G. Harris Mori-is, Ph.D., and Sydney Rowland, 

 M.A. Communicated by Sir Henry E. Roscoe, F.R.S 250 



On the Thermodynamical Properties of Gases and Vapours as deduced 

 from a Modified Form of the Joule-Thomson Equation, with Special 

 Reference to the Properties of Steam. By H. L. Callendar, M.A., 

 LL.D., F.R.S., Quain Professor of Experimental Physics, University 

 College, London 266 



Note on Inquiries as to the Escape of Gases from Atmospheres. By 

 G. Johnstone Stouey, M.A., Hon. D.Sc., F.RS 286 



South African Horse-sickness : its Pathology and Methods of Protec- 

 tive Inoculation. By Alexander Edington, M.B., C.M., F.R.S.E., 

 Director of the Colonial Bacteriological Institute, Cape Colony. 

 Communicated by Sir David Gill, F.R.S 292 



Note on the Occurrence of a Seed-like Fructification in certain Palaeo- 

 zoic Lycopods. By D. H. Scott, M.A., Ph.D., F.RS., Honorary 

 Keeper of the Jodrell Laboratory, Royal Gardens, Kew 306 



No. 439. 



The Demarcation Current of Mammalian Nerve. (Preliminary Com- 

 munication.) I. The Demarcation Current of Mammalian Nervt-. 



