IV CONTENTS OF VOL. XXXIII. SIXTH SERIES. 



NUMBEE CXCIV.— FEBEITAEY. 



Page 



Lord Eayleigh on Methods for detecting small Optical 

 Eetardations, and on the Theory of: Eoucault's Test 161 



Dr. E. H. Kennard on Unipolar Induction : Another Expe- 

 riment and its Significance as Evidence for the Existence 

 of the ^Ether ' 179 



Prof. W. M. Thornton on the Limits of Innam inability of 

 Gaseous Mixtures 190 



Prof. W. M. Thornton on the Relation of Oxygen to the 

 Heat of Combustion of Organic Compounds 196 



Prof. C. V. Eaman and Mr. Ashutosh Dev on Discontinuous 

 Wave-Motion : Part II. (Plate III.) 203 



Prof. E. E. Eamsey on an Atomic Model 207 



Mr. J. J. Manlev on the Lubrication of Eesistance-Box 

 Plugs : 211 



Dr. L. Silberstein on Dispersion and the Size of Molecules of 

 Hydrogen, Oxygen, and Nitrogen 215 



Mr. E. H. Kent : A Note on Eadiation 223 



NUMBEE CXCV.— MAECH. 



Mr. A. T. Waterman on the Positive Ionization from Certain 

 Hot Salts, together with some Observations on the Electrical 

 Properties of Molybdenite at High Temperatures 225 



Dr. S. Chapman and Dr. E. W. Dootson on Thermal 

 Diffusion 248 



Prof. D. N. Mallik and Prof. A. B. Das on High Vacuum- 

 Spectra of Gases. (Plate IV.) 253 



Mr. M. N. Shaha on Maxwell's Stresses 256 



The Earl of Berkeley : Notes on Osmotic Theory 261 



Messrs. E. G. Parker and A. J. Dalladay on a Precision 

 Method of uniting Optical Glass — the Union of Glass in 

 Optical Contact by Heat Treatment. (Plate V.) 276 



Mr. G. H. Livens on the Energy in the Electromagnetic 

 Eield 286 



Prof. E. E. Sahni on the Scattering of a Particles by 

 Gases. (Plate VI.) 290 



Proceedings of the Geological Society : — 



Mr. H. A. Baker on the Palaeozoic Platform beneath 

 the London Basin and Adjoining Areas, and on the 

 Disposition of the Mesozoic Strata upon it 296 



