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THE U5 



THE m j 



LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



CONDUCTED BY 



SIR ROBERT KANE, LL.D. F.R.S. M.R.I.A. F.C.S. 



AND 



WILLIAM 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. Polii. lib. i. cap. 1 . Not. 



VOL. XLL— FOURTH SERIES. 

 JANUARY— JUNE 1871. 



'tirt 



LONDON. 



TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET, 



Printers and Publishers to the University of London ; 



SOLD BY LONGMANS, GREEN, READER, AND DYER ; SIMPKIN, MARSHALL AND CO. 



WIIITTAKER AND CO.; AND KENT AND CO., LONDON: BY ADAM AND 



CHARLES BLACK, AND THOMAS CLARK, EDINBURGH J 

 SMITH AND SON, GLASGOW; HODGES AND 

 SMITH, DUBLIN ; AND PUTNAM, 

 NEW YORK. 





