THE 
AMERICAN JOURNAL 
SCIENCE AND ARTS. 
EDITORS AND PROPRIETORS, 
JAMES D. DANA, B. SILLIMAN, ann E. S. DANA. 
ASSOCIATE EDITORS, 
Prorressors ASA GRAY anp WOLCOTT GIBBS, 
OF CAMBRIDGE, 
Proressors H. A. NEWTON, 8S. W. JOHNSON, 
GEO. J. BRUSH anp A. E. VERRILL, 
OF NEW HAVEN, 
Proressor EDWARD ©. PICKERING, or Boston. 
a THIRD SERIES. 
VOL. XIL—[WHOLE NUMBER, CXII.] 
JULY TO DECEMBER, 1876. 
WITH FIVE PLATES. 
NEW HAVEN: EDITORS. 
1876. 
Miss0UR! BOTANICAL 
GARDEN LIBRARY 
