﻿ol. 41. JANUARY 1871. No. 270. 



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 Tilloch's f 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.C.S. 



AND 



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



FOURTH SERIES. 



N° 270.— JANUARY 1871. 



WITH A PLATE, 

 Illustrative of Frederick Guthrie's Experiments on Magnetism and 



Diamagnetism. 



LONDON: 



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

 Printers and Publishers to the University of London. 



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

 Co.; Whittaker and Co. ; and H. Bailliere, London : — and by A. and C. Black, and 

 Thomas Clark, Edinburgh; Smith and Son, Glasgow: — Hodges and Smith, 

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



