/ 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



CONDUCTED BY 



LORD KELVIN, G.G.Y (;>. 'I}.O.L. LL.D. F.R.S. &c. 

 JOHN JOL^,'M.A. DVSc. F.kk i,k^%^ 



WILLL^M FRANiClS, Ph.D. F.L.S..I^.H>>^.S. F.C.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. eap. 1. Not. 



VOL. VL— SIXTH SERIES. 

 JULY— DECEMBER 1903. 



LONDON'. 

 TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. 



SOLD BY SIXIPKIN, 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. BOYYEAU, 



PARIS ; — AND ASHER AND CO., BERLIN. 



fi0?09 



