7 e>. 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



r 



JOURNAL OF SCIENCE. 



CONDUCTED BY 



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



A N D 



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. l.Not. 



VOL. XIX.— SIXTH SERIES. 

 JANUARY— JUNE 1910. 



' LOtfDOA:', 

 TAYLOR AND FRANCIS, RED LION COURT. FLEET STREET. 



SOLD BY SIMl'KIN, MARSHALL. HAMILTON. KENT, AND CO., ID. 



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



VK.rVK J. BOYVKAU, PARIS: — AND ARIIEB AND CO., BBR/.IN. 



i)£ 



