Vol.3. MAY 1877. No. 19. 



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



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloclis ( Philosophical Magazine? 

 Nicholson's i Journal ,' and Thomson's 'Annals of Philosophy.'' 



CONDUCTED BY 



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

 SIR WILLIAM THOMSON, Knt. LL.D. F.RS. &c. 



AND 



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

 FIFTH SERIES. K\ <P 



N° 19.— MAY 1877. 





WITH TWO PLATES, 



Illustrative of Mr. W. J. Lewis's Paper on Crystallographical Forms of 

 Glaucodote, and Dr. K. Heumann's on Luminous Flames. 



LONDON: 



PRINTED BY TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET, 



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 Sold by Longmans, Green, Reader and Dyer j Kent and Co. ; Simpkin, Marshall and 

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