﻿VI CONTENTS OF VOL. XXIX. SIXTH SERIES. 



Page 



Mr. S. Butterworth on the Coefficients of Self and Mutual 

 Induction of Coaxial Coils 578 



Mr. T. Carlton Sutton on the van der Waals Formula (and 

 the Latent Heat of Vaporization) 693 



Dr. Allan Ferguson on the Boiling-Points and Critical 

 Temperatures of Homologous Compounds 599 



The Earl of Berkeley and Mr. E. G. J. Hartley on a New 

 Form of Sulphuric-Acid Drying- Vessel 609 



The Earl of Berkeley and Mr. D. E. Thomas on a Sensitive 

 Method for Examining some Optical Qualities of Glass 

 Plates 613 



Prof. O. W. Eichardson and Prof. F. J. Eogers on the Photo- 

 electric Effect.— Ill 618 



Mr. Fernando Sanford on the Contact Difference of Potential 

 of Distilled Metals 623 



Notices respecting New Books : — 



Bulletin of the Bureau of Standards 621 



NUMBEK CLXXIIL— MAT. 



Dr. C. Y. Burton on the Scattering and B/egular Eeflexion 



of Light by Gas Molecules. — Part 1 625 



Prof. J. A. Pollock on a New Type of Ion in the Air 036 



Miss M. 0. Saltmarsh on the Brightness of Intermittent 



Illumination 646 



Dr. L. Vegard : Remarks regarding the Series Spectrum of 



Hydrogen and the Constitution of the Atom 651 



Mr. G. 11. Livens on the Electron Theory of the Optical 



Properties of Metals. — Part II 655 



Messrs. Arthur Holmes and Eobert W. Lawson : Lead 



and the End Product of Thorium (Part II.) 673 



Dr. J. E. Wilton on Eipples 6S8 



Dr. Frank L. Hitchcock on the Operator V in Combination 



with Homogeneous Functions 700 



Dr. L. Silberstein on Eadiation from an Electric Source, and 



Line Spectra : The Hydrogen Series 709 



Dr. li. Stanley Allen on an Atomic Model with a Magnetic 



Core 714 



Mr. E. W. Varder on the Absorption of Homogeneous 



(j Eays 725 



Mr. T. Carlton Sutton: Photo-electric Constant and Atomic 



Heat 734 



