Vol. 22. NOVEMBER 1886. No. 138. 



Published the First Day of every Month. — Price 2s. 6d. 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloclis 'Philosophical Magazine? 

 Nicholson's 'Journal? and Thomson's 'Annals of Philosophy.' 



CONDUCTED BY 



SIR ROBERT KANE, LL.D. F.R.S. M.R.I.A. F.0.8. 

 SIR WILLIAM THOMSON, Knt. LL.D. F.R.S. &c. 



AND 



WILLIAM FRANCIS, Ph.D. F.L.S. F.R.A.S. F.C.S. 



FIFTH SERIES. 



N° 138.— NOVEMBER 1886. 



WITH TWO PLATES. 



Illustrative of Mr. T. Gray's Paper on the Electrolysis of Silver and of 

 Copper ; and Prof. M. A. Corfu's on the Distinction between Spectral 

 Lines of Solar and Terrestrial Origin. 



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