CONTENTS OF VOL. I, 



(SIXTH SEEIES). 



NUMBEE I.— JANUAEY 1901. 



Page 

 Mr. William Barlow on Crystal Symmetry. The Actual 



Basis of the Thirty-two Classes. (Plates I. & II.) 1 



Prof. E. W. Wood and Mr. C. E. Magnusson on the Ano- 

 malous Dispersion of Cyanin. (Plates III. & IV.) 36 



Dr. H. J. H. Sand on the Concentration at the Electrodes in 

 a Solution, with special reference to the Liberation of 

 Hydrogen by Electrolysis of a Mixture of Copper Sulphate 



and Sulphuric Acid 45 



Prof. A. P. Chattock, Miss W. E.Walker, and Mr. E. H. Dixon 



on the Specific Yelocitiesof IonsintheDischar^efromPoints. 79 

 Lord Eayleigh on Balfour Stewart's Theory of the Connexion 



^between Eadiation and Absorption 98 



Lord Eayleigh 's Spectroscopic Notes concerning the Gases 



of the Atmosphere 100 



Mr. E. F. Gwyther on the Pre ,ressive Long Waves of Soli- 

 tary and Periodic Types in Shallow Water 106 



Prof. Karl Pearson on some Applications of the Theory of 



Chance to Eacial Differentiation 110 



Dr. J. T. Bottomley and Mr. W. T. Evans on the Measurement 



of the Expansibility of a Hard Jena Glass 125 



Dr. C. H. Lees on the Viscosities of Mixtures of Liquids and 



of Solutions 128 



Mr. E. F. Earhart on the Sparking Distances between Plates 



for Small Distances 147 



Dr. E. H. Barton on the Eefraction of Sound by Wind .... 159 

 Notices respecting New Books : — 



Die Partiellen Differential-Gleichungen der Mathemat- 

 ischen Physik. Xach Eiemann's Vorlesungen in 



Vierte Auflage neu bearbeitet von H. Weber 166 



Proceedings of the Geological Society : — 



Mr. P. Chapman on the Consolidated iEolian Sands of 



Kathiawar 167 



Mr. A. K. Coomara-Swainy on Ceylon Eocks and Graphite 168 



