Vol.3. JANUARY 1877. No. 15. 



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



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation oj Tilloch's 'Philosophical Magazine, 

 Nicholson's l Jour naif and Thomson's 'Annals of Philosophy' 



CONDUCTED BY 



SIR ROBERT 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. 



N° 15.-JANUARY 1877. 



.-. 



LONDON: 



*>v TAvr.OE AND FRANCIS, RED LION COURT, FLEET STREET, 



^^^^^^Q&^^^^^G^t^^c the U7dversit y of London. 



f d Kent and Co.; Simpkin, Marshall and 



) I I RR A R V H F POMP D roo ft> • and C. Black, and Thomas Clark, Edin- 

 , LlUimni Ur bUIMbntob, $ ges, Foster, and Co., Dublin:— Putnam, 



Chap. .____#_ rZ ___. 



Shelf 3M&_ 



UNITED STATES OF AMERICA % 



