Vll 



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The Halogen Hydrides as Conducting Solvents. Part IV. Prelimi- 

 nary Notice. By B. D. Steele, D. M'Intosh, and E. H. Archibald. 

 Communicated by Sir William Kamsay, K.C.B., F.E.S 321 



u Analysis of the Eesults from the Falmouth Magnetograms on 

 " Quiet " Days during the Twelve Years 1891 to 1902. By Charles 

 Chree, Sc.D., LL.D., F.R.S., Superintendent of the Observatory 

 Department of the National Physical Laboratory. (Abstract) 323 



Effect of Liquid Air Temperatures on the Mechanical and other 

 Properties of Iron and its Alloys. By Sir James Dewar, F.R.S., 

 Hon. M.I.C.E., and Robert Abbott Hadfield, M.I.C.E., President 

 elect Iron and Steel Institute 326 



?he Effects of Temperature and Pressure on the Thermal Conductivities 

 of Bodies. Part I. The Effect of Temperature on the Thermal Con- 

 ductivities of some Electrical Insulators. By Charles H. Lees, D.Sc. 

 Communicated by Arthur Schuster, F.R.S. (Abstract) 337 



the Normal Series satisfying Linear Differential Equations. By E. 

 Cunningham. Communicated by Dr. H. F. Baker, F.R.S. (Abstract) 339 



le Flow of Water through Pipes. Experiments on Stream-line 

 Motion and the Measurement of Critical Velocity. By H. T. Barnes, 

 D.Sc., Assistant Professor of Physics, and E. G. Coker, M.A., D.Sc., 

 Associate Professor of Civil Engineering, McGill University. Com- 

 municated by Professor Osborne Reynolds, F.R.S 341 



Role of Diffusion during Catalysis by Colloidal Metals and Similar 

 Substances. By Henry J. S. Sand, Ph.D., M.Sc., University College, 

 Nottingham. Communicated by Professor J. H. Poynting, F.R.S 356 



Galvanic Cells produced by the Action of Light. Preliminary Com- 

 munication. By M. Wilderman, Ph.D., B.Sc. (Oxon). Communicated 

 by Dr. Ludwig Mond, F.R.S 369 



No. 504. February 24, 1905. 



Experiments on the Nature of the Opsonic Action of the Blood Serum. 

 By William Bulloch, M.D., and E. E. Atkin, B.A., Bacteriological 

 Laboratory, London Hospital, E. Communicated by Leonard Hill, 

 M.B., F.R.S ; 379 



Note on the Effects produced on Rats by the Trypanosomata'of Gambia 

 Fever and Sleeping Sickness. By H. G. Plimmer, F.L.S. Commu- 

 nicated by Dr. C. J. Martin, F.R.S 388 



Further Histological Studies on the Localisation of Cerebral Function. 

 The Brains of Felis, Cants, and Sus compared with that of Homo. 

 By Alfred Walter Campbell, M.D. Communicated by Professor 

 Sherrington, F.R.S. (Abstract) 390 



Exterior Ballistics. " Error of the Day " and other Corrections to 

 Naval Range-tables. By Professor George Forbes, F.R.S 392 



The Theory of Symmetrical Optical Objectives. Part II. By S. D. 

 Chalmers, B.A., St. John's College, Cambridge, M.A., Sydney. Com- 

 municated by Professor Larmor, Sec. R.S 396 



