CONTENTS {continued). 



PAGE 



XII. On the Interchange of the Variables in certain Linear Differential 

 Operators. By E. B. Elliott, M.A., Fellow of Queen's College, 

 Oxford 358 



XIII. On the Rate of Decomposition of Chlorine-water by Light. By 



G. GrOBE, LL.D., F.E.S. . . 362 



XIV. Barium Sulphate as a Cement in Sandstone. By Feane: Clowes, 

 D.Sc, Principal and Professor of Chemistry and Metallurgy in 

 University College, Nottingham ■ 363 



XV. Deposits of Barium Sulphate from Mine-water. By Frank Clowes, 



D. Sc, Principal and Professor of Chemistry and Metallurgy in 

 University College, Nottingham ■ . 368 



XVI. Protoplasmic Movements and their Relation to Oxygen Pressure. By 



James Claek . . 370 



XVII. Note on the Development of Voltaic Electricity by Atmospheric 



Oxidation of combustible Oases and other Substances. By C. R. 

 Aldee Weight, D.Sc, F.R.S., Lecturer on Chemistry and Physics, 

 and C. Thompson, F.I.C., F.C.S., Demonstrator of Chemistry, in 

 St. Mary's Hospital Medical School 372 



XVIII. On certain Oeometrical Theorems. No. 4. By W. H. L. Russell, 

 A.B., F.R.S 376 



XIX. An Experimental Verification of the Sine Law of Malus. By 



E. J. Spitta . . 376 



XX. Observations on the Spark Discharge. Bj> J. Jolt .... 376 



List of Presents . 376 



Obituary Notices : — 



Sie Chaeles James Fox Btjnbuet, Bart xiii 



Asa Gteay xv 



Sie William O'Shaughnesst Beooke xviii 



ERRATA, Vol. 46. 



Published by Triibner and Co. 

 Royal 4to. pp. xiv-326, cloth. Price 21*. 

 OBSERVATIONS OF THE INTERNATIONAL POLAR EXPEDITIONS. 



1882-1883. 

 F o e t R a e . 

 With 32 Lithographic Folding Plates. 

 A reduction of price to Fellows of the Royal Society. 



