IV CONTENTS OF VOL. XLIV. FIFTH SERIES. 



Page 



Messrs. J. S. Ames and W. J. Humphreys on the 

 Effect of Pressure upon the Series in the Spectrum of an 



Element 119 



Mr. Byron Briggs Brack ett on the Effects of Tension and 

 Quality of the Metal upon the Changes in Length pro- 

 duced in Iron Wires by Magnetization 122 



Proceedings of the Geological Society : — 



Capt. H. G. Lyons on a Portion of the Nubian Desert 



South-east of Korosko 125 



Dr. Charles Callaway on the Origin of some of the 



Gneisses of Anglesey 126 



Mr. E. Percy Richards on the Gravels and associated 



Deposits at Newbury (Berks) 126 



Mr. Thomas H. Holland on Augite-Diorites with Micro- 

 pegmatite in Southern India 128 



.Rev. J. F. Blake on the Laccolites of Cutch and their 



Relations to the other Igneous Masses of the District. 129 

 Dr. W. Eraser Hume on the Cretaceous Strata of County 



Antrim 130 



Messrs. C. I. Gardiner and S. H. Reynolds on the 



Portraine Inlier 132 



Measurement of Electrolytic Conductivity by Continuous 



Currents, by W. Stroud 133 



Surface Tension of Water and of Dilute Aqueous Solutions, 



by N, Ernest Dorsey 1 34 



Preliminary Note on the Energy Spectrum of a Black Body, 

 by C. E. Meudenhall and F. A. Saunders 136 



NUMBER CCLXVIL— AUGUST. 



Mr. T. H. Blakesley on a new Definition of Focal Length, 

 and an Instrument for determining it L 37 



Prof. A. Gray's Note on Mr. Blakesley's paper, " A new 

 Definition of Focal Length, &c." 144 



Dr. Edwin H. Barton on the Attenuation of Electric Waves 

 along Wires and their Reflexion at the Oscillator 145 



Mr. C. S. Whitehead on the Effect of a Spherical Conducting 

 Shell on the Induction at a Point in the Dielectric outside 

 due to an Alternating Current in a Circular Circuit in the 

 Dielectric inside, the Axis of the Conductor passing 

 through the Centre of the Shell 154 



Messrs. C. W. Waidner and F. Mallory on a Comparison of 

 Rowland's Mercury Thermometers with a Griffiths Plati- 

 num Thermometer 165 



Mr. W. S. Day on a Recalculation of Rowland's Value of the 

 Mechanical Equivalent of Heat, in terms of the Paris 

 Hydrogen-Thermometer 169 



