V 



1 . . Pa s 8 



The Measurement of the Ratio of Lateral Contraction to Longitudinal 



Extension in a Body under Strain. By A. Mallock 157 



The Motion of two Spheres in a Fluid. By W. M. Hicks, M.A., St. 

 John's College, Cambridge 162 



Microscopical Researches in High Power Definition. By G. W. Royston- 

 Pigott, M.A., M.D. Cantab., F.R.S 164 



Note on Spectroscopic Papers. By G. D. Liveing, M.A., Professor of 

 I Chemistry, and J. Dewar, M.A., F.R.S., Jacksonian Professor, Uni- 

 versity of Cambridge 166 



The Determination of the Secular Effects of Tidal Friction by a Graphical 

 Method. By G. H. Darwin, M.A., formerly Fellow of Trinity College, 

 Cambridge 168 



Researches in Chemical Equivalence. Part III. Nickelous and Cobalt- 

 ous Sulphates. By Edmund J. Mills, D.Sc, F.R.S., and J. J. Smith.... 181 



On the Formation of Hydrocyanic Acid in the Electric Arc. By James 

 Dewar, M.A., F.R.S., Professor of Chemistry to the Royal Institu- 

 tion 188 



On the Production of Coloured Spectra by Light. By Captain Abney, 

 R.E., F.R.S 190 



Relations between the Atomic Weights and certain Physical Properties 

 (Melting and Boiling Points and Heats of Formation) of Elements and 

 Compounds. By Thomas Carnelley, D.Sc, Assistant Lecturer on 

 Chemistry in Owens College, Manchester 190 



Separate Enumerations of Primes of the Form 4?i+l and of the Form 

 4n+'X By J. W. L. Glaisher, M.A., F.R.S., Fellow of Trinity College, 

 Cambridge 192 



On the Effects of Chloroform and Ether on the Radial Tracing. By C. 

 Handheld Jones, M.B. Cantab., F.R.S 197 



Preliminary Note on a new Tide-Predieter. By E. Roberts, F.R.A.S 198 



Double Refraction and Dispersion in Iceland Spar. An Experimental 

 Investigation with a Comparison with Huyghens' Construction for the 

 Extraordinary Wave. By R. T. Glazebrook, M.A., Fellow of Trinity 

 College, Cambridge 202 



On the Vapour Densities of Potassium and Sodium. By Professor James 

 Dewar, M.A., F.R.S., and Alexander Scott, B.A.. 206 



The Physical Properties of Liquid Acetylene. By Gerrard Ansdell, 

 F.C.S., Chemical Assistant to the Royal Institution of Great Britain.... 209 



On the Origin of the Mineral, Structural, and Chemical Characters of 

 Ophites and related Rocks. By Professors W. King, Sc.D., and T. H. 

 Rowney, Ph.D 214 



Note upon the Behaviour of Oxalic Acid and the Oxalates of the Alkalies, 

 and of Potassium Iodide in Sunlight. By Arthur Downes, M.D., and 

 Thomas P. Blunt, M.A., Oxon 219 



Preliminary Experiments on the Effects of Long-continued Stress on the 

 Elasticity of Metals. By J. T. Bottomley, M.A., F.R.S.E 221 



