CONTENTS OF VOL. XXV. 



(FIFTH SEEIES). 



NUMBER CL1L— JANUARY 1888. 



Page 

 Mr. E. F. J. Love on a Method of Discriminating Real from 

 Accidental Coincidences between the Lines of different 



Spectra; with some Applications. (Plate I.) 1 



Eev. O. Fisher on the Mean Height of the Surface-Elevations, 

 and other Quantitative Results of the Contraction of a Solid 

 Globe through Cooling ; regard being paid to the existence 

 of a level of no strain, as lately announced by Mr. T. M, 



Reade and by Mr. C. Davison 7 



Mr. H. E. Armstrong on Valency, especially as defined by 



Helmholtz 21 



Mr. T. H. Blakesley on a Geometrical Determination of the 

 Conditions of Maximum Efficiency in the case of the Trans- 

 mission of Power by means of Alternating Electric Currents .30 



Prof. Tait on the Motion of a Gas " in Mass " 38 



Mr. A. E. H. Love on Dedekind's Theorem concerning the 



Motion of a Liquid Ellipsoid under its own Attraction .... 40 

 Mr. H. Tomlinson on the Effect produced on the Thermo- 

 electrical Properties of Iron when under Stress or Strain by 



raising the Temperature to Bright-red 45 



Prof. H. Lamb on the Theory of Electric Endosmose and other 

 Allied Phenomena, and on the Existence of a Sliding Co- 

 efficient for a Fluid in contact with a Solid 52 



Proceedings of the Geological Society : — 



Prof. T. G. Bonney on some Results of Pressure and of 

 Intrusive Granite in Stratified Palaeozoic Rocks near 



Morlaix, in Brittany 71 



Prof. T. M'K. Hughes on the Position of the Obermitt- 



weida Conglomerate 71 



Prof. T. G. Bonney on the Obermittweida Conglomerate : 



its Composition and Alteration 72 



Prof. T. G. Bonney on the Huronian Series in the neigh- 

 bourhood of Sudbury (Canada) 72 



Recent Discoveries of Gold in the Transvaal 73 



