CONTENTS of N° 237.— Fourth Series. 



XXVIII. On certain Cobaltamines. By Edmund J. Mills, D.Sc, 

 F.C.S page 245 



XXIX. Synthesis of White Light from the Colours of the Spec- 

 trum. By C. J. Woodward, B.Sc 261 



XXX. Investigation of the Alteration produced by Heat in the Ve- 

 locity of Propagation of Light in Water. By Richard Ruhlmann. 

 (With a Plate.) 262 



XXXI. On the Direct Transformation of Chloriodide of Ethylene 

 into Glycol. By Maxwell Simpson, M.D., F.R.S 282 



XXXII. Note of Experiments upon the Conduction of Heat by 

 Liquids. By Frederick Guthrie, Ph.D., F.R.S.E., Professor of 

 Physics and Chemistry, Royal College, Mauritius 283 



XXXIII. On Mr. C. F. Varley's Reciprocal Electrophorus. By 

 Sir William Thomson, LL.D., F.R.S 287 



XXXIV. Electrolytic Investigations. By M. P. A. Favre 289 



XXXV. Note on a Lecture-Experiment. By C. Hockin, M.A.. . 299 



XXXVI. Notices respecting New Books : — Mr. A. W. Cunning- 

 ham's Notes on the History, Methods, and Technological importance 

 of Descriptive Geometry, compiled with reference to Technical Edu- 

 cation in France, Germany, and Great Britain 301 



XXXVII. Proceedings of Learned Societies : — 



Royal Society : — The Rev. F. Bashforth on the Resistance of 

 the Air to the Motion of Elongated Projectiles having variously 

 formed Heads ; Mr. J. A. Longridge on the Resistance of 

 the Air to Rifled Projectiles 301-307 



Royal Institution : — Mr. H. E. Roscoe on Vanadium, one of 

 the Trivalent Group of Elements 307 



Geological Society : — Mr. J. W. Judd on the Speeton Clay; 

 Prof. J. Phillips on the Hessle Drift ; The Duke of Argyll 

 on the Geological Structure of Argyllshire ; Mr. C. Babbage 

 on the Parallel Roads of Glen Roy ; Mr. D. Mackintosh on 

 the Origin of smoothed, rounded, and hollowed surfaces of Lime- 

 stone and Granite, on an apparent oblique lamination in Gra- 

 nite, and on the Encroachment of the Sea in the Bristol Chan- 

 nel ; Mr. T. M'K. Hughes on the two Plains of Hertfordshire 

 and their Gravels 314-317 



XXXVIII. Intelligence and Miscellaneous Articles : — 



On the Duration of Induction-currents, by P. Blaserna 318 



On the Passage of Electrical Currents through Incandescent 



Gases, by M. E. Becquerel 319 



On the Woodwardite of Cornwall, by M. F. Pisani 320 



Dialysis of Induction-currents, byM. Bouchotte 322 



* # * It is requested that all Communications for this Work may be addressed, 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



