2 ■ - 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



and j, ^ /Q y 



JOURNAL OF SCIENCE. 



LORD KELVIN, G.C.V.O. D.C.L. LL.D. F.R.S. Ac. 

 JOHN JOLY, M.A. D.Sc. F.R.S. F.G.S. 



AND 



WILLIAM FRANCIS, F.L.S. 



" Nee aranearum sane textus ideo melior quia ex se fila gignunt, nee noster 

 vilior quia ex alienis libaraus ut apes." Just. Lips. Polit. lib. i. cap. 1. Not. 



VOL. X.— SIXTH SERIES. 

 JULY— DECEMBER 1905. 



LONDON: 

 TAYLOE AND FRANCIS, RED LION COURT, FLEET STREET. 



SOLD BY SIMPKIN, MARSHALL, HAMILTON, KENT, AND CO., LD. T. AND T. CLARK, 



EDINBURGH ; — SMITH AND SON, GLASGOW; — HODGES, FIGGIS, AND 



CO., DUBLIN? PUTNAM, NEW YORE ; — VEUVE J. BOYVEAU, 



PARIS; AND ASHER AND CO., BERLIN. 



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