2.^ 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND /0' 



JOURNAL OF SCIENCE. 



CONDUCTED BY 



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. 



WILLIAM FRANCIS, F.L.S. 



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

 ilior quia ex alienis libamus ut apes." Just. Lips. Polit. lib. i. cap. 1 . Not. 



VOL. IX.— SIXTH SERIES. 

 JANUARY— JUNE 1905. 



TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. 



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



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



CO., DUBLIN; PUTNAM, NEW YORK J — YEUVE J. BOYVEAU, 



PARIS; AND ASHER AND CO., BERLIN. 



84G49 



