Ge a 
THE mt :) 
AMERICAN JOURNAL 
SCIENCE AND ARTS. 
EDITORS AND PROPRIETORS, 
- Proressors JAMES D. DANA anv B. SILLIMAN. 
ASSOCIATE EDITORS, 
Prorressors ASA GRAY anp WOLCOTT GIBBS, 
OF CAMBRIDGE, 
AND 
Prorrssors H. A. NEWTON, S. W. JOHNSON, 
GEO. J. BRUSH anp A. E. VERRILL, 
OF NEW HAVEN. 
THIRD SERIES. 
VOL, I1L—[WHOLE NUMBER, CHIT.) 
Nos. 13--18. 
JANUARY TO JUNE, 1872. 
WITH TWO MAPS AND THIRTEEN PLATES. 
NEW HAVEN: EDITORS. 
1872. 
PRINTED BY TUTTLE, MOREHOUSE & TAYLOR, 22] STATE ST. 
RESe@oUR) Bota’ CAL 
@aapun Lisi 2Y 
