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On an Effect of Light upon Magnetism. By Shelf ord Bid well, M.A., 

 F.E.S 453 



Eecalescence of Iron. By J. Hopkinson, F.E.S 455 



Electrical Eesistance of Iron at a High Temperature. By J. Hopkinson, 

 F.E.S 457 



List of Presents.... ... 458 



March 28, 1889. 



The Structural Arrangement of the Mineral Matters in Sedimentary and 

 Crystalline Pearls. By George Harley, M.D., F.E.S 460 



On the descending Degenerations which follow Lesions of the Gyrus 

 marginalis and Gyrus fornicatus in Monkeys. By E. P. France. With 

 an Introduction by Professor Schafer, F.E.S. (from the Physiological 

 Laboratory, University College, London) 460 



On certain Ternary Alloys. 1. Alloys of Lead, Tin, and Zinc. By C. E. 

 Alder Wright, D.Sc., F.E.S., Lecturer on Chemistry and Physics, and 

 C. Thompson, F.C.S., F.I.C., Demonstrator of Chemistry in St. Mary's 

 Hospital Medical School 461 



The Diurnal Variation of Terrestrial Magnetism. By Arthur Schuster, 

 F.E.S., Professor of Physics, with an Appendix by H. Lamb, F.E.S., 

 Prof essor of Mathematics, Owens College, Manchester 481 



On the Conditions for effective Scour in Drain-pipes of Circular Section. 

 By Henry Hennessy, F.E.S., Professor of Applied Mathematics and 

 Mechanism in the Eoyal College of Science for Ireland 486 



List of Presents..., ... 486 



The Spinal Curvature in an Aboriginal Australian. By D. J. Cunning- 

 ham. M.D. (Edin. and Dubl.), Professor of Anatomy in the University 

 of Dublin 487 



The Principles of training Eivers through Tidal Estuaries, as illustrated 

 by Investigations into the Methods of improving the Navigation 

 Channels of the Estuary of the Seine. By Leveson Francis Vernon- 

 Harcourt, M.A., M.Inst.C.E. (Plates 24) .' 504 



On the Cranial Nerves of Elasmobranch Fishes. Preliminary Commu- 

 nication. By J. C. Ewart, M.D., Eegius Professor of Natural History, 

 University of Edinburgh 524 



No. 279. April 4, 1889. 



On the Magnetic Inclination, Force, arid Declination in the Caribee 

 Islands, West Indies. By T. E. Thorpe, Ph.D., F.E.S 538 



Experiments on the Eesistance of Electrolytic Cells. By Capt. H. E. 

 Sankey, E.E 541 



The Ferment Action of Bacteria. By T. Lauder Brunton, M.D., F.E.S., 

 and A. Macfadyen, M.A., B.Sc 544 



