

THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



CONDUCTED BY 



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

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



AND 



AVILLIAM FRANCIS, Ph.D. F.L.S. F.R.A.S. F.C.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. II.— SIXTH SERIES. 

 JULY— DECEMBER 1901. 



LONDON-. 

 TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. 



SOLD 8T SIMPKIN, MARSHALL, HAMILTON, KENT, AND CO., LD. — T. AND T. CLARK, 

 EDJNBL'RGIJ ; — SMITH AND SON, GLASGOW; — HODGES, FJGGTS. ANp 



CO , DUBLIN; — PUTNAM, NEW YORK, — YEUVE J. 

 PARTS; — AND ASHER AND CO., BERLIN 



Tf€55 



