CONTENTS OF VOL. IX 



(SIXTH SERIES). 



NUMBER XLIX.-JANUARY 1905. 



Pa»e 



Dr. S. Young on the Boiling-Points of Homologous Com- 

 pounds 1 



Dr. H. J. S. Sand on the Measurement of the Potential of 

 the Electrodes in Stationary Liquids. The Determination 

 of Changes of Concentration at the Cathode during Elec- 

 trolysis. (Plate I.) 20 



Mr. P. E. B. Jourdain on Transfinite Cardinal Numbers of 

 the Exponential Eorm 42 



Mr. W. Makower on the Molecular Weights of Radium and 

 Thorium Emanations 56 



Mr. W. E. Williams on the Magnetic Change of Resistance in 

 Iron, Nickel, aud Nickel-Steel at Various Temperatures . . 77 



Mr. H. Hilton on Crystallographic Projections 85 



Mr. J. Stevenson on the Chemical and Geological History of 

 the Atmosphere 88 



Prof. T. R. Lyle : Investigation of the Variations of Mag- 

 netic Hysteresis with Frequency. (Plate II.) 102 



Mr. G. F. C. Seirle on a Method of Determining the Thermal 

 Conductivity of Copper 125 



Messrs. J. Morrow and E. L. Watkin on an Interference 

 Apparatus for the Calibration of Extensometers 129 



Dr. C. Chree on the Lateral Vibration of Bars 134 



Mr. Gr. B. Dyke on the Practical Determination of the Mean 

 Spherical Candle-Power of Incandescent and Arc Lamps. 

 (Plate III.) 136 



Dr. G. A. Blanc on Radioactivity of Mineral Springs 148 



Dr. W. E. Sumpner on the Measurement of Small Differences 

 of Phase 155 



Dr. Max Planck on Clausius' Theorem for Irreversible Cycles, 

 and on the Increase of Entropy 1 67 



Prof. J. H. Poynting on the Tangential Stress due to Light 

 incident obliquely on an Absorbing Surface L69 



Rev. P. J. Kirkby on the L T nion of Hydrogen and Oxygen at 

 Low Pressures through the Passage of Electricity 171 



Notices respecting New Books 185-192 



