VI CONTENTS OF VOL. XIX. SIXTH SERIES. 



NUMBER CXIL— APRIL. 



Page 



Prof. A. P. Chattock and Mr. A. M. Tyndall on the Pressure of 

 the Electric Wind in Hydrogen containing traces of Oxygen. 449 



Mr. J. M. Kuehne on the Electrostatic Effect of a Changing 

 Magnetic Field 461 



Dr. J. Robinson on Konig's Theory of the Ripple Formation 

 in Kundt's Tube . 476 



Mr. R. Hargreaves on the Iguoration Problem. Explicit form 

 of Result 486 



Dr. P. Lowell on Photographs of Jupiter taken at the Lowell 

 Observatory, April 1909, by Mr. E. C. Slipher and the 

 Director, Dr. P. Lowell 488 



Mr. A. Campbell on the Use of Mutual Inductometers .... 497 



Prof. C. H. Lees on the Laws regarding the Direction of 

 Thermo-electric Currents enunciated by M. Thomas .... 508 



Prof. A. H. Gibson on the Variation of Disk Resistance with 

 Temperature in Water 513 



Dr. J. W. Nicholson on the Bending of Electric Waves round 

 a Large Sphere 516 



Prof. H. L. Callendar on Electrical Recording Thermometers 

 for Clinical Work 538 



Prof. Harry C. Jones and Mr. W. W. Strong on the Absorption 

 Spectra of certain Uranous and Uranyl Compounds .... 566 



Dr. W. C. McC. Lewis on the Energy of a " Double-layer" 

 Condenser of Electronic Origin 573 



Mr. H. Bateman on the Solution of the Integral Equation 

 connecting the Velocity of Propagation of an Earthquake- 

 Wave in the Interior of the Earth with the Times which 

 the Disturbance takes to travel to the different Stations 

 on the Earth's Surface 576 



Mr. H. Redmayne Nettleton on a New Method of Deter- 

 mining Thermal Conductivit}-. (Plate VII.) 587 



Dr. H. Wilde on a new Binary Progression of the Planetary 

 Distances, and on the Mutability of the Solar System .... 597 



Mr. W. A. Borodowsky on Absorption of ft Rays from 

 Radium by Solutions and Liquids 605 



Mr. A. I. Steven on Anomalous Effects on First Loading a 

 Wire, and some Effects of Bending Overstrain in Soft 

 Iron Wires 619 



Dr. J. W. Nicholson on the Size of the Tail-particles of 

 Comets, and their Scattering Effect on Sunlight 626 



Prof. J. Jolv and Mr. A. L. Fletcher on Pleochroic Halos. 

 (Plates VIII. & IX.) 630 



Mr. G. H. Berrv on the Striking Point of Pianoforte Strings. 

 (Plates X. & XL) 648 



Notices respecting New Books : — 



Physical Science in the time of Nero 651 



Proceedings of the Geological Society 653-656 



