Vol.41. APRIL 1896. No. 251 



Published the First Bay of every Month. 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of TillocKs 'Philosophical Magazine, 9 

 Nicholson s 'Journal J and Thomson's 'Annals of Philosophy' 



CONDUCTED BY 



LORD KELVIN, LL.D. F.R.S. Ac. 



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. 



ft— *,< 



FIFTH SERIES* 



N° 251.— APRIL 1896. 



WITH TWO PLATES. 



Illustrative of Prof. Witkowski's Paper on the Thermodynamic 

 Properties of Air. 



LONDON: 



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