

9 4*/^ 



THE 



f 



LONDON, EDINBURGH, and DUBLIN 



HILOSOPHICAL 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. 



WILLIAM FRANCIS, F.L.S. 



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

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



VOL. XIV.— SIXTH SERIES. 

 JULY— DECEMBER 1907. 



LONDON: 



TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET 



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



SMITH AND SON, GLASGOW; — HODGES, FIGGIS, AND CO., DUBLIN; 



VEUVE J. BOYVEAU. PARIS ; AND ASHER AND CO., BERLIN. 



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