C ASSELL'S 



NATURAL HISTORY 



EDITED BY 



P. MARTIN DUNCAN M.B. (LOND.) F.R.S. F.G.S. 



PaOFESSOR OF GEOLOGY IN AND HONORARY FELLOW OF KING'S COLLEGE LONDON 

 CORRESPONDENT OF THE ACADEMY OF NATURAL SCIENCES PHILADELPHIA 



YOL. IV. 



ILL USTRATED 



CASSELL AND COMPANY LIMITED 



LONDON PARIS & MELBOURNE 



1894 



ALL BIGHTS RESERVED 



