CONTENTS OF VOL. XXXL 



(FIFTH SERIES). 



NUMBER CLXXXVIIL— JANUARY 1891. 



Page 

 Dr. J. H. Grladstone and Mr. Gr. Grladstone on the Refraction 



and Dispersion of Fluorbenzene and allied Compounds .... 1 

 Mr. C. Barus on the Chemical Equilibrium of Solids, in its 



Relation to Pressure and to Temperature 9 



Mr. W. Ellis on the Diurnal Variations of Maguetic Elements, 



as depending on the Method of Tabulation 36 



Dr. J. H. Grladstone and Mr. W. Hibbert on Secondary 



Batteries 42 



Messrs. C. V. Boys, A. E. Briscoe, and W. Watson on the 



Measurement of Electromagnetic Radiation. (Plate V.) . . 44 

 Mr. E. J. Smith on the Measurement of the Time of the Fall 



of Magnetization in a Magnetized Iron Cylinder 64 



Proceedings of the Geological Society : — 



Prof. A. De Lapparent on the Porphyritic Rocks of the 



Island of Jersey , 66 



Mr. T. H. Holland on Rock-Specimens collected by Mr. 



W. Gowland in the Korea , 67 



Rev. A. Irving on the Stratigraphy of the Bagshot Beds 



of the London Basin (north side) 67 



Mr. R. D. Oldham's Account of an Experimental Inves- 

 tigation of the Law that Limits the Action of Flowing 



Streams 68 



Dr. H. Hicks on the Rocks of North Devon 69 



Mr. H. J. Marten on some Water-worn and Pebble-worn 

 Stones taken from the Apron of the Severn Commis- 

 sioners' Weir erected across the River at Holt Fleet 



about 8 miles above Worcester 70 



Prof. E. Hull on the Physical Geology of Tennessee and 

 adjoining Districts in the United States of America . . 70 

 Experimental Investigations on Thomson's Law of Wave- 

 motion on Water, by 0. Riess 71 



On the Condensation of Aqueous Vapour in Capillary Spaces, 

 by G-. van der Mensbrugghe 74 



