Vol. 23. MARCH 1887. No. 142. 



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THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE. 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloch's 'Philosophical Magazine, 1 

 Nicholson's 'Journal] and Thomson s 'Annals of Philosophy 1 



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. <>^ 



N° 142.— MARCH 1887. "^ 



WITH ONE PLATE. 



Illustrative of Lord Kayleigh's Paper on the Behaviour of Iron and 

 Steel under the Operation of Feeble Magnetic Forces. 



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