﻿^ol. 38. DECEMBER 1894. No. 235. 



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 TillocJis 'Philosophical Magazine,' 

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



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



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



FIFTH SERIES. 



N° 235.-DECEMBER 1894. 



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Illustrative of Mr. F. L. O. Wadsworth's Paper on a very Sensitive 

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