V^ol. 35. MARCH 1893. No. 214- 



Published the First Day of every Month, 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOUENAL OF SCIENCE. 



Being a Continuation of Tilloclis 'Philosophical Magazine/ 

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



CONDUCTED BY 



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



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° 214.— MARCH 1893. 



WITH TWO PLATES. 



Illustrative of Mr. Caul Barus's Papers on the Fusion Constants of 



Igneous liock. 



LONDON: 



PRINTED BY TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. 



Sold by Siinpsin, Marshal], Hamilton, Kent, and Co., Ld. ; Whittaker and Co.; 

 and by A. and C. Black ; — T. and T. Clurk, Edinburgh; Smith aiut Son, 

 Glasgow: — Hodges, JFigtjjis, and Co., Dublin. — Putnam, .New iorn.:— Veuve J. 

 Boy veau, Paris : — and Asher and Co., Berlin. 



