Voh 34 - AUGUST 1867. 



No. 228. 



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 Tilloch's 'Philosophical Magazine,' 

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



CONDUCTED HY 



SIR DAVID BREWSTER, K.H. LL.D. F.R.S. L &E &c 

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

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



FOURTH SERIES. 



N° 228.— AUGUST 1867. 



WITH A PLATE, 



Illustrative of Mr. H.Wilde's Experimental Researches in Magnetism 



and Electricity. 



LONDO N: 



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



Printers and Publishers to the University of London. 



WILLIAM WESLEY, ( 



Bookseller nni ^ubltsljrr. I 



Fleet Street, London. 



