.1. MARCH 1876. No. 3. 



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 TillocJis 'Philosophical Magazine ,' 

 Nicholson's c Journal ,' 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. 



AOT 



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



FIFTH SERIES. 



N° 3.— MARCH 1876, 



LONDON: 



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



Printers and Publishers to the University of London. 

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

 Co. ; and Whittaker and Co. ; — and by A. and C. Black, and Thomas Clark, Edin- 

 burgh; Smith and Son, Glasgow: — Hodges, Foster, and Co., Dublin: — Putnam, 

 New York : — and Asher and Co., Berlin. 



