40. AUGUST 1895. No. 243. 



?d the First Day of every Month, — Price 2s. 6d. 



ms&t- THE 



LONDON, EDINBURGH, and DUBLIN 



HILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloclis 'Philosophical Magazine? 

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



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LORD KELVIN, LL.D. P.R.S. <fcc. 



GEORGE FRANCIS FITZGERALD, M.A. Sc.D. F.R.S, 



AND 



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



FIFTH SERIES. 



N° 243.— AUGUST 1895. 



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