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On the Dielectric Constants of Metallic Oxides dissolved or suspended 

 in Ice cooled to the Temperature of Liquid A ir. By James Dewar, 

 M.A., LL.D., F.E.S., Fullerian Professor of Chemistry in the Royal 

 Institution, and J. A. Fleming, M.A., D.Sc, F.R.S. Professor of 

 Electrical Engineering in University College, London 368 



Further Observations on the Dielectric Constants of Frozen Electro- 

 lytes at and above the Temperature of Liquid Air. By J. A. Fleming, 

 M.A., D.Sc, F.R.S., Professor of Electrical Engineering in Univer- 

 sity College, London, and James Dewar, M.A., LL.D., F.RS., Ful- 

 lerian Professor of Chemistry in the Royal Institution 380 



Meeting of June 17, 1897, and List of Papers read 396 



An Investigation on the Variability of the Human Skeleton with 

 especial Reference to the Naqada Race, discovered by Professor 

 Flinders Petrie in his explorations in Egypt. By Ernest Warren, 

 B.Sc. Communicated by Professor W. F. R. Weldon, F.R.S 398 



The Average Contribution of each several Ancestor to the total 

 Heritage of the Offspring. By Francis Galton, D.C.L., Sc.D., F.R.S. 401 



Further Note on the Influence of a Magnetic Field on Radiation Fre- 

 quency. By Oliver Lodge, F.R.S., assisted by Mr. Benjamin Davies 413 



Fifth Report to the Roval Society Water Research Committee. By 

 H. Marshall Ward, Sc.D., F.R.S., F.L.S., Professor of Botany in the 

 University of Cambridge 415 



No. 377. 



On the Action exerted by certain Metals and other Substances on a 

 Photographic Plate. By W. J. Russell, Ph.D., F.R.S., Lecturer on 

 Chemistry at St. Bartholomew's Hospital 424 



On the relative Behaviour of the H and K lines of the Spectrum of 

 Calcium. Bv William Huggins, D.C.L., LL.D., F.R.S., and Mrs. 

 Huggins (Plate 4) 433 



Further Observations of Enhanced Lines. By J. Norman Lockyer, 



C. B., F.R.S 441 



The Total Solar Eclipse of August 9, 1896. Report on the Expedition 

 to Kio Island. By J. Norman Lockyer, C.B., F.R.S 444 



On the Classification of Stars of the d Cephei Class. By J. Norman 

 Lockyer, C.B., F.R.S 445 



On Lunar and Solar Periodicities of Earthquakes. By Arthur Schuster, 

 F.R.S 455 



The Vector Properties of Alternating Currents and other Periodic 

 Quantities. By W. E. Sumpner, D.Sc. Communicated by 0. Hen- 

 rici, F.R.S 465 



Note on recent Investigations on the Mechanical Equivalent of Heat. 

 By E. H. Griffiths, F.R.S 479 



Cathode Rays and some analogous Rays. By Silvan us P. Thompson, 



D. Sc, F.R.S 481 



Electrification of Air, of Vapour of Water, and of other Gases. By 

 Lord Kelvin, G.C.V.O., F.R.S., Magnus Maclean, D.Sc, F.R.S.E., 

 and Alexander Gait, B.Sc, F.R.S.E 483 



