CONTENTS OF VOL. XIV. SIXTH SERIES. V 



Page 

 Lord Rayleigh on the Light dispersed from fine Lines ruled 

 upon -Reflecting Surfaces or transmitted by very narrow 



Slits 350 



Prof. J. J. Thomson on Rays of Positive Electricity 359 



Dr. J. "W. Nicholson on the Scattering of Sound by Spheroids 



and Disks 364 



Mr. T. H. Blakesley on Logarithmic Lazytongs and Lattice- 

 works 377 



Mr. A. S. Eve on Ionization by Spraying 382 



Mr. E. A. N. Pochin on Experimental Mathematics 395 



Messrs. W. Wilson and W. Makower on the Rate of: Decay 



of the Active Deposit from Radium 404 



Dr. C. G. Barkla and Mr. C. A. Sadler on Secondary X-Rays 



and the Atomic Weight of Nickel , 408 



Mr. S. H. Burbury on the Work which may be gained during 



the Mixture of Gases 422 



Prof. W. H. Bragg and Dr. W. T. Cooke on the Ionization 



Curve of Methane 425 



Intelligence and Miscellaneous Articles : — 



The Photanthistan : a New Instrument for the Com- 

 parison of Luminous Intensities and Absorption 

 Coefficients, by J. J. Taudin Chabot 428 



NUMBEE LXXXIL— OCTOBER. 



Prof. W. H. Bragg on the Properties and Natures of various 



Electric Radiations , 429 



Prof. G. Melander on the Production of (Statical Electricity 



by the Action of Heat and Light 450 



Prof. D. N. Mallik on Magnetic Induction in Spheroids .... 455 

 Mr. J. Russell on the Superposition of Mechanical Vibrations 



(Electric Oscillations) upon Magnetization and conversely, 



in Iron, Steel, and Nickel. (Plate XI.) 468 



Prof. R. W. Wood on a Simple Treatment of the Secondaiy 



Maxima of Grating Spectra 477 



Mr. J. Prescott on the Figure of the Earth 482 



Mr. A. Campbell on the Measurement of Mutual Inductance 



by the Aid of a Vibration Galvanometer. (Plate XII.) . , 494 

 Mr. P. V. Bevan on Lloyd's Fringes for Internal Reflexion, 



and the Change of Phase of Ordinarily Reflected Light. 



(Plate XIII.) .... 503 



Dr. G. Bakker on the Theory of Surface-Forces 509 



Messrs. Gwilym Owen and A. LI. Hughes on Condensation 



Nuclei produced by Cooling Gases to Low Temperatures . . 528 

 Mr. E. Cunningham on the Electromagnetic Mass of a Moving 



Electron 538 



Mr. A. Stephenson on Expansion in BesseFs Functions .... 547 



