a 

 Vll 



Page 

 Meeting of February 16, 1899, and List of Papers read 343 



Observations on the Cerebro-Spinal Fluid in the Human Subject. By 

 StClair Thomson, M.D., Leonard Hill, M.B., and W. D. Halliburton, 

 M.D., F.RS 343 



The Thermal Deformation of the Crystallised Normal Sulphates of 

 Potassium, Rubidium, and Cresium. By A. E. Tutton, B.Sc. Com- 

 municated by Captain Abney, C.B., F.RS 350 



On the Reflex Electrical Effects in Mixed Nerve and in the Anterior 

 and Posterior Roots. By Miss S. C. M. Sowton. Communicated by 

 A. D. Waller, M.D., F.R.S 353 



No. 410. 



Meeting of February 23, 1899, and List of Papers read 359 



The Efficiency of Man, or Economic Coefficient of the Human Machine. 

 By W. Marcet, M.D., F.R.S., and R. B. Floris, F.C.S 360 



Some Experiments bearing on the Theory of Voltaic Action. By J. 

 Brown. Communicated by Professor Everett, F.R.S 369 



Deposition of Barium Sulphate as a Cementing Material of Sandstone. 

 By Frank Clowes, D.Sc., Emeritus Professor, University College, 

 Nottingham. Communicated by Professor H. E. Armstrong, 

 F.RS 374 



On the Reflection of Cathode Rays. By A. A. Campbell Swinton. 

 Communicated by Lord Kelvin, F.RS , 377 



On the Order of Appearance of Chemical Substances at different Stellar 

 Temperatures. By Sir Norman Lockyer, K.C.B., F.RS 396 



Meeting of March 2, 1899, and List of Candidates 402 



List of Papers read, March 2 403 



Perturbations of the Leonids. By G. Johnstone Stoney, M.A., D.Sc., 

 F.RS., and A. M. W. Downing, M.A., D.Sc., F.RS 403 



On Hydrogen Peroxide as the Active Agent in producing Pictures on 

 a Photographic Plate in the Dark. By W. J. Russell, Ph.D., 

 V.P.RS. 409 



No. 411. 

 Meeting of March 9, 1899, and List of Papers read 419 



On Flapping Flight of Aeroplanes. By Maurice F. FitzGerald, Pro- 

 fessor of Engineering, Queen's College, Belfast. Communicated by 

 Professor G. F. FitzGerald, F.T.C.D., F.RS , 420 



A Preliminary Note upon certain Organisms isolated from Cancer, and 

 their Pathogenic Effects upon Animals. By H. G. Plimmer, 

 M.R.C.S., F.L.S., Pathologist, and Lecturer on Pathology and Bac- 

 teriology, St. Mary's Hospital, London. Communicated by Pro- 

 fessor J. Rose Bradford, F.R.S .' 431 



