ol. 38. OCTOBER 1869. No. 255. 



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



THE 



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LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloch's ( Philosophical Magazine, 9 

 Nicholsons 'Journal? and Thomson's 'Annals of Philosophy, 9 



CONDUCTED BY 



SIR ROBERT KANE, LL.D. F.R.S. M.R.I.A. F.C.S. 

 AUGUSTUS MATTHIESSEN, Ph.D. F.R.S. F.C.S. 



AND 



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



FOURTH SERIES. 



N° 255.— OCTOBER 1869. 



WITH TWO PLATES, 

 Illustrative of Dr. W. M. Watts's Paper on the Spectra of Carbon, and 

 Dr. H. Herwig's Investigations on the Conformity of Vapours to 

 Mariotte and Gay-Lussac's Law. 



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