IV 



No. 391. 



Page 

 Meeting of March 17, 1898, Croonian Lecture, &c 63 



Meeting of March 24, 1898, Bakerian Lecture, &c 63 



On the Relation between the Diurnal Range of Magnetic Declination 

 and Horizontal Force and the Period of Solar Spot Frequency. By 

 William Ellis, F.R.S., formerly of the Royal Observatory, Green- 

 wich , 64 



On the Relative Retardation between the Components of a Stream of 

 Light produced by the Passage of the Stream through a Crystalline 

 Plate cut in any direction with respect to the Faces of the Crystal. 

 By James Walker, M.A. Communicated by Professor R. B. Clifton, 

 F.R.S 79 



An Extension of Maxwell's Electro-magnetic Theory of Light to in- 

 clude Dispersion, Metallic Reflection, and Allied Phenomena. By 

 Edwin Edser, A.R.C.S. Communicated by Captain W. de W. Abney, 

 C.B., F.R.S 91 



CROONIAN LECTURE. The Nature and Significance of Functional Meta- 

 bolism in the Plant (Das Wesen und die Bedeutung des Betriebsstof- 

 wechsels in der Pflanze). By Wilhelm Pfeffer, Sc.D. (Cantab.), of the 

 University of Leipzig, For. Mem. R.S 93 



BAKERIAN IJECTTJRE. Further Experiments on the Action exerted by 

 certain Metals and other Bodies on a Photographic Plate. By W. J. 

 Russell, Ph.D., V.P.R.S 102 



No. 392. 



On Contact Electricity of Metals. By J. Erskine-Murray, D.Sc., 

 F.R.S.E., Heriot-Watt College. Communicated by Lord Kelvin, 

 G.C.V.O., F.R.S 113 



No. 393. 



the Rotation of Plane of Polarisation of Eleciric Waves by a Twisted 

 Structure. By Jagadis Chunder Bose, M.A., D.Sc., Professor of 

 Physical Science, Presidency College, Calcutta. Communicated by 

 Lord Rayleigh, F.R.S 146 



On the Production of a " Dark Cross " in the Field of Electro-magnetic 

 Radiation. By Jagadis Chunder Bose, M.A., D.Sc., Professor of 

 Physical Science, Presidency College, Calcutta. Communicated by 

 Lord Rayleigh, F.R.S 152 



The Relations between Marine Animal and Vegetable Life. By H. M. 

 Vernon, M.A., M.B. Communicated by Professor Burdon Sander- 

 son, F.R.S 155 



No. 394. 



Report of the Kew Observatory Committee- for the Year ending 

 December 31, 1897 161 



