SUPPLEMENTARY NUMBER. 



Vol.11. No. 71 



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



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 

 JOURNAL OF SCIENCE. 



Being a Continuation of Tilloctis 'Philosophical Magazine? 

 Nicholsons i Journal ,' and Thomson's 'Annals of Philosophy.'' 



CONDUCTED BY 



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

 SIR WILLIAM THOMSON, Knt. LL.D. F.R.S. &c. 



AND 



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



FIFTH SERIES.I ( l 



N° 71.— SUPPLEMENT. JUNE 1881. 



WITH THREE PLATES, 



Illustrative of Messrs. Rowland and Nichols's Paper on Electric Ab- 

 sorption of Crystals, and Prof. A. Gr. Bell's upon the Production of 

 Sound by Radiant Energy. 



This Supplement to Vol. XL is published with the regular Number 

 for June, and should be delivered with it to Subscribers. 



LONDON: 



PBINTED BY TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET, 



Sold by Longmans, Green, Reader and Dyer ; Kent and Co. ; Simpkin, Marshall and 

 Co. ; and Whittaker and Co. ; — and by A. and C. Black, and Thomas Clark, Edin- 

 burgh; Smith and Son, Glasgow : — Hodges, Foster and Co., Dublin: — Putnam, 

 New York : — and Asher and Co., Berlin. 



