**> *~ to 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



CONDUCTKD BY 



SIR OLIVER JOSEPH LODGE, D.Sc, LLiD., F.R.S. 



SIR JOSEPH JOHN THOMSON, M.A., SaL>., LL.D., F.R S. 



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



GEORGE CAREY FOSTER, B.A., LL.D ? , F.R.S. 



AND 



WILLIAM FRANCIS, KL.S. 



" Nee aranearum sane textus ideo nielior quia ex se flla gignunt, npc noster 

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



VOL. XXIV.— SIXTH SERIES. 

 JULY— DECEMBER 1912. 



•' .-' LONDON: „.-£ V',/ V 

 TAYLOR AND FKANCISJ RED LION.CO'URT, 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. 



•:'; 



j7)± 4 O 



