THE 
LONDON, EDINBURGH, anv DUBLIN 
PHILOSOPHICAL MAGAZINE 
AND 
JOURNAL OF SCIENCE. 
CONDUCTED BY 
SIR ROBERT KANE, LL.D. F.R.S. M.R.LA. F.C.S. 
SIR WILLIAM THOMSON, Kyr. LL.D. F.R.S. &e. 
AND 
WILLIAM FRANCIS, Pu.D. F.L.S. F.R.A.S. F.C.S. 
‘¢ Nec aranearum sane textus ideo melior quia ex se fila gignunt, nec noster 
vilior quia ex alienis libamus ut apes.” Just. Lips. Polit. lib.i. cap. 1. Not. 
VOL. XIX.—FIFTH SERIES. 
JANUARY—JUNE 18835. 
—— 
a ee 
TES, Wisi d 
LONDON: 
TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET, 
SOLD BY LONGMANS, GREEN, AND CO.; KENT AND CO.; SIMPKIN, MARSHALL, AND CO.; 
AND WHITTAKER AND CO.;—AND BY ADAM AND CHARLES BLACK, AND 
T. AND T. CLARK, EDINBURGH}; SMITH AND SON, GLASGOW ;—— 
HODGES, FOSTER, AND CO., DUBLIN ;—-PUTNAM, NEW YORK ;— 
VEUVE J. BOYVEAU, PARIS ;—AND ASHER AND CO., BERLIN. 
