THE 
LONDON, EDINBURGH, and DUBLIN 
PHILOSOPHICAL MAGAZINE 
AND 
JOURNAL OF SCIENCE. 
CONDUCTED BY 
JOHN JOLY, M.A. D.Sc. F.R.S. F.G-.S. 
AND 
WILLIAM FRANCIS, F.L.S. 
" Nee aranearum sane textus ideo melior quia ex se fila gignunt, nee noster 
vilior quia ex alienis libamus ut apes." Just. Lips. Polit. lib. i. cap. 1. Not. 
VOL. XV.— SIXTH SERIES. 
JANUARY— JUNE 1908. 
TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. 
SOLD BY SIHPKIN, MARSHALL, HAMILTON, KENT, AND CO., LD. 
SMITH AND SON, GLASGOW; — HODGES, FIGGIS, AND CO., DUBLIN: 
VEUVE J. BOYVEAU, PARIS \ AND ASHER AND CO., BERLIN. 
I 
