fot bet 
AMERICAN JOURNAL 
SCIENCE AND ARTS. 
EDITORS AND PROPRIETORS, 
Proressors JAMES D. DANA anv B. SILLIMAN. 
ASSOCIATE EDITORS, 
Prorrssors ASA GRAY ann 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. IL—[WHOLE NUMBER, CII.| 
Nos. 7-12. 
JULY TO DECEMBER, 1871. 
WITH A PLATE AND A MAP. 
NEW HAVEN: EDITORS 
i871. 
ine 
PRINTED BY TUTTLE, MOREHOUSE & TAYLOR, 221 STATE ST. 
