Vol.3. FEBRUARY 1877. No. 16. 



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



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOUKNAL OF SCIENCE. 



Being a Continuation of TillocKs 'Philosophical Magazine, 

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



CONDUCTED BY 



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

 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. 





<2r 



N° 16.— FEBRUARY 1877, 



LONDON: 



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

 Printers and Publishers to the University of London. 

 Sold by Longmans, G-reen, Eeader and Dyer j Kent and Co. ; Simpkin, Marshall and 

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