36. SEPTEMBER 1893. No. 220. 



Published the First Day of every Month. — Price 2s. Qd. 



THE 

 LONDON, EDINBURGH, and DUBLIN 



'HILOSOPHICAL MAGAZINE, 

 JOURNAL OF SCIENci^v^C 



Being a Continuation of Tilloctis 'Philosophical Magazine? 

 Nicholson's 'Journal? and Thomson's 'Annals of Philosophy.'* 



CONDUCTED BY 



LORD KELVIN, LL.D. P.R.S. &e. 



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° 220.— SEPTEMBER 1893. 



WITH ONE PLATE. 



llustrative of Profs. Dewar and Fleming's Paper on the Electrical 

 Resistance of Metals and Alloys at Temperatures approaching the 

 Absolute Zero. 



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