IV CONTENTS OF VOL. V. SIXTH SERIES. 



Dr. H. M. Ami on the Great Saint-Lawrence-Chaui plain- 

 Appalachian Fault of America 174 



Mr. A. K. Coomaraswamy on the Point-de-G-alle Group 

 (Ceylon): Wollastonite-Scapolite G-neisses 174 



Prof. S. H. Reynolds and Mr. A. Vaughan on the Jurassic 

 Strata cut through by the South Wales Direct Line 



between Filton and Wootton Bassett 175 



Intelligence and Miscellaneous Articles :— 



Hodgkins Medal 176 



Landolt-Bornstein, Physikalisch-chemischen Tabellen .. 176 



NUMBER XXYL— FEBRUARY. 



Prof. E. Rutherford on the Magnetic and Electric Deviation 

 of the easily absorbed Rays from Radium 177 



Mr. F. L. Hitchcock on Vector Differentials 187 



Lord Kelvin :. Animal Thermostat 198 



Dr. Marshall Watts on the Existence of a Relationship 

 between the Spectra of some Elements and the Squares of 

 their Atomic Weights 203 



Dr. Meyer Wilderinan on the Theory of the Connexion be- 

 tween the Energy of Electrical Waves or of Light intro- 

 duced into a System and Chemical Energy, Heat Energy, 

 Mechanical Energy, &c. of the same 208 



Mr. Walter Makower on a Determination of the Ratio of the 

 Specific Heats at Constant Pressure and at Constant Volume 

 for Air and Steam. (Plate I.) 226 



Lord Rayleigh on the Spectrum of an Irregular Disturbance . 238 



Prof. A. Schuster on the Influence of Radiation on the 

 Transmission of Heat. (Plate II.) 243 



Prof. R. W. Wood on Screens Transparent only to Ultra- 

 violet Light, and their Use in Spectrum Photography. 

 (Plates III. & IV.) 257 



Dr. Gr. Johnstone Stoney : How to apply the Resolution of 

 Light into L T niform Undulations of Flat Wavelets to the 

 Investigation of Optical Phenomena 264 



Mr. W. C. D. Whetham on the Theory of Electrolytic Dis- 

 sociation 279 



Notices respecting New Books : — 



Annuaire pour FAn 1903 290 



Compte Rendu du deuxieme Congrcs International des 



Mathematiciens 290 



Prof. L. Boltzmann's Lecons sur la Theorie des G-az . . 291 

 Prof. P. Drude's The Theory of Optics 292 



