IV 



CONTENTS OF VOL. XXIX. FIFTH SERIES. 



NUMBEE CLXXVIL— FEBEUAEY. 



Page 



Mr. Carl Barns on the Pressure-Variations of certain High- 

 Temperature Boiling-Points 141 



Mr. Shelford Bidwell on the Electrification of a Steam-jet . . 158 



Prof. Hermann Karsten on the Geological Age of the Moun- 

 tains of Santa Marta 163 



Mr. James 0. M c Connel on Diffraction-Colours, with special 

 reference to Corona? and Iridescent Clouds 167 



Lord Eayleigh on the Vibrations of an Atmosphere 173 



Eric Gerard on a Process of Plotting Curves by the Aid of 

 Photography „ 180 



Mr. Arthur Schuster on the Disruptive Discharge of Electri- 

 city through Gases 182 



Mr. C. A. Carus-Wilson on the Behaviour of Steel under 

 Mechanical Stress. (Plates IH.-V.) 200 



Prof. A. Gray on Sensitive Galvanometers 208 



Notices respecting New Books : — 



Eev. O. Eisher's Physics of the Earth's Crust 211 



On the Eesistance of Hydrogen and other Gases to the Current 

 and to Electrical Discharges, and on the Heat developed in 

 the Spark, by E. Villari , 214 



Further Investigations on the Inert Space in Chemical Eeac- 

 tions, by O. Liebreich 216 



Lecture Experiment to prove the Existence of the Direct and 

 Inverse Extra Currents, by M. C. Daguenet 216 



NITMBEE CLXXVIIL— MAECH. 



Mr. A. W. Elux on the Form of Newton's Eings 217 



Prof. John Perry on Twisted Strips 244 



Mr. Spencer U. Pickering on a New Form of Mixing- Calori- 

 meter. (Plate VII.) 247 



H. E. J. G. du Bois on Kerr's Magneto-optic Phenomenon . . 253 

 Mr. Fred. T. Trouton on the Acceleration of Secondary Elec- 

 tromagnetic "Waves. (Plate VI.) 268 



Sir William Thomson on the Time-Integral of a Transient 



Electromagnetically Induced Current 276 



Proceedings of the Geological Society : — 



Prof. J. Prestwich on the Eelation of the Westleton Beds 



or < Pebbly Sands ' of Suffolk to those of Norfolk .... 280 

 Prof. C. Lloyd Morgan on the Pebidian Volcanic Series 



of St. Davids 282 



Prof. T. G. Bonney on the Crystalline Schists and their 

 Eelation to the Mesozoic Eocks in the Lepontine Alps 284 



