Vol. 32. SEPTEMBER 1866. No. 215. 



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



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of Ttlloch's ? Philosophical Magazine, 3 

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



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SIR DAVID BREWSTER, K.H. LL.D. F.R.S. L.&E. &c. 

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



FOURTH SERIES. 



N° 215.— SEPTEMBER, 1866. 



WITH TWO PLATES, 



Illustrative of Prof. R. Bunsen's Paper on the Phenomena observed in the 



Absorption-spectrum of Didymium. 



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