VI CONTENTS OP VOL. VIII. FIFTH SERIES. 



Page 

 Mr. C. T. Clough on the Whin Sill of Teesdale as an Assi- 



milator of the surrounding Beds 420 



Prof. T. M' Kenny Hughes on the Silurian Rocks of the 



Valley of the Clwyd _ 420 



On the Alteration of the Density of Steel by Hardening and 



Tempering, by Carl Fromme 421 



Determinations of the Vapour-Densities, at High Tempera- 

 tures, of Substances that attack Mercury, by L. Pfaundler . . 424 



NTJMBEK LI.— DECEMBER. 



Dr. E. L. Nichols's new Explanation of the Colour of the Sky 425 

 Mr. C. C. Hutchinson on the Separation and Estimation of 

 Cadmium in the Presence of Zinc ; with Remarks upon the 



Separation of Copper, Cadmium, and Zinc 433 



Prof. F. Rosetti's Experimental Researches on the Tempera- 

 ture of the Sun 438 



Messrs. Guthrie and Boys on Magneto-Electric Induction. 



(Plate XIII.) 449 



Dr. T. Carnelley on the Influence of Atomic Weight. 461 



Lord Rayleigh's Investigations in Optics, with special reference 



to the Spectroscope 477 



Prof. H. F. "Weber's Researches on the Elementary Law of 



Hydrodiffusion 487 



On the Specific Heats and Melting-points of divers Refrac- 

 tory Metals, by J. Violle 501 



Researches on Daltonism, by J. Mace and W. Nicati 502 



On a new Hygrometer, by Fr. Schwackhofer 503 



On the Galvanic Oxidation of Gold, by M. Berthelot 504 



NUMBER LIL— SUPPLEMENT. 



Prof. S. P. Thompson on the Action of Magnets on Mobile 

 Conductors of Currents. (Plate XIV.) 505 



Dr. O. J. Lodge on the Determination of the Variation of the 

 Thermal Conductivity of Metals with Temperature, by means 

 of the permanent Curve of Temperature along a uniform 

 thin Rod heated at one end. (Second Paper.) .......... 510 



Prof. H. F. Weber's Researches on the Elementary Law of 

 Hydrodiffusion 523 



Prof. F. Rosetti's Experimental Researches on the Tempera- 

 ture of the Sun 537 



Mr. R. Hunt on the Influence of the Solar Rays on Vegetation 550 



