Electrolytic Conduction in Relation to Molecular Composition, Valency, 

 and the nature of Chemical Change : being an Attempt to apply a 

 Theory of " Eesidual Affinity." By Henry E. Armstrong, Ph.D., 

 F.R.S., Professor of Chemistry, City and Guilds of London Central 

 Institution » 268 



List of Presents « 291 



No. 244.— April 1, 1886. 



On the Correction to the Equilibrium Theory of Tides for the Continents. 

 I. By G. H. Darwin, LL.D., F.R.S., Fellow of Trinity College, and 

 Plumian Professor in the University of Cambridge. II. By H. H. 

 Turner, B.A., Fellow of Trinity College, Cambridge 303 



Description of Fossil Remains of two Species of a Megalanian Genus 

 (Meiolania, Ow.), from Lord Howe's Island. By Sir Richard Owen, 

 K.C.B., F.B.S 315 



On the Luni- Solar Variations of Magnetic Declination and Horizontal 

 Force at Bombay, and of Declination at Trevandrum. By Charles 

 Chambers, F.B.S 316 



On a New Form of Stereoscope. By A. Stroh 317 



April 8,1886. 



Croonian Lecture. — On the Coagulation of the Blood. By L. C. Wool- 

 dridge, M.B., D.S., Demonstrator of Physiology in Guy's Hospital and 

 Research Scholar to the Grocers' Company 320 



April 15, 1886. 



Preliminary Notes on certain Zoological Observations made at Talisse 

 Island, North Celebes. By Sydney J. Hickson, D.Sc, B.A 322 



Dynamo-electric Machines. By John Hopkinson, D.Sc, F.R.S., and 

 Edward Hopkinson, D.Sc 326 



May 6, 1886. 



List of Candidates 329 



On an Effect produced by the Passage of an Electric Discharge through 

 Pure Nitrogen. By J. J. Thomson, M.A., F.B.S., Fellow of Trinity 

 College, Cavendish Professor of Experimental Physics, Cambridge, and 

 R. Threlfall, B.A., Caius College, Cambridge, Prof essor of Experimental 

 Physics in the University of Sydney 329 



Some Experiments on the Production of Ozone. By J. J. Thomson, M.A., 

 F.R.S., Fellow of Trinity College, and Cavendish Professor of Experi- 

 mental Physics in the University of Cambridge, and R. Threlfall, Caius 

 College, Cambridge, and Professor of Experimental Physics in the 

 University of Sydney 340 



The Influence of Stress and Strain on the Physical Properties of Matter. 

 Part I. Elasticity — continued. The Effect of Change of Temperature 

 on the Internal Friction and Torsional Elasticity of Metals. By 

 Herbert Tomlinson, B.A 343 



