THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



CONDUCTED BY 



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

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



AND 



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



M Nee aranearum sane textus irleo melior quia ex se fila gignunt, nee noster 

 vilior quia ex alienis libamus ut apes." Just. Lips. Polit. lib. i. cap. l.Not. 



VOL. IV.— SIXTH SERIES. 

 JULY— DECEMBER 1902. 



LONDON: 

 TAYLOR AXD FHANCIS, RED LION COURT," FLEET STREET. 



SOLD 3Y SIMPKIN, MARSHALL, HAMILTOX, KENT, AXD CO., LD. — T. AXD T. CLARK. 



EDIXBURGII; — SMITH AXD SOX, GLASGOW; — HODGES, FIGGIS. AND 



CO , DU3LIN; — PUTNAM, NEW YORE ; — YEUVE J. BOYVBAU, 



PASI8; — AXD ASITEF. AXD CO., BERLIN, 



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