CASSELL'S 
NATURAL HISTORY. 
EDITED BY 
P. MARTIN DUNCAN, M.B. (LOND.), F.R.S., F.G.S., 
PROFESSOR OF GEOLOGY IN AND HONORARY FELLOW OF KING’S COLLEGE, LONDON; 
CORRESPONDENT OF THE ACADEMY OF NATURAL SCIENCES, PHILADELPHIA. 
VOL. I 
ILL US TEA TED . 
Cassell, Petter, Galpin & Co. 
LONDON , PARIS & NEW YORK. 
ALL RIGHTS RESERVED.] 
1883. 
