THE 



^05 



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. 

 SIR WILLIAM THOMSON, Knt. LL.D. F.R.S. &c. 



AND 



WILLIAM FRANCIS, Ph.D. F.L.S. F.R.A.S. F.C.S. 



" Nee aranearum sane textus ideo raelior quia ex se fila gignunt, nee noster 

 vilior quia ex alienis libamus ut apes." Just. Lips. Polil. lib. i. cap. 1 . Not. 



VOL. II.— FIFTH SERIES. 

 JULY— DECEMBER 1876. 



LONDON. 



TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET, 

 Printers and Publishers to the University of London ; 



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



AND CO. J AND WHITTAKER AND CO. ; AND BY ADAM AND CHARLES BLACK, 



AND THOMAS CLARK, EDINBURGH; SMITH AND SON, GLASGOW: 



DODGES, FOSTER, AND CO, DUBLIN: PUTNAM, NEW 



YORK : — AND ASnER AND CO., BERLIN. 



