rol.4. DECEMBER 1877. No. 27 



Publislied the First Day of every Month. — Price 2«. 6(i. 



THE 

 LONDON, EDINBUKGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AJSTD 



JOURNAL OF SCIENCE. 



Being a Continuation of TillocJis ^Philosophical Magazine,^ 

 Nicholson^ s ^ Journal,^ and Thomson's 'Annals of Philosophy,^ 



n 



j^n^ 



CONDUCTED BY 



SIR ROBERT feA^TE, LL.D. F.R.S. M.R.I.A. F.C.S, 

 SIR WILLIAM THOMSOl!^, Knt. LL.D. F.R.S. <fec. 



AND 



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



FIFTH SERIES. 



N° 27.-'DECEMBEIl 1877. 



LONDON: 



FEINTED Br TAYLOR AND FBANCISj BED 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, G-lasgow : — Hodges, Poster, and Co., Dublin : — Putnam, 

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