AMERICAN JOURNAL 
SCIENCE AND ARTS. 
CONDUCTED BY 
PROFESSORS B. SILLIMAN, B, SILLIMAN, Jr., 
JAMES D. DANA, 
IN CONNECTION WITH 
PROF. ASA GRAY, or CAMBRIDGE, 
PROF. LOUIS AGASSIZ, or CAMBRIDGE, 
DR. WOLCOTT GIBBS, or NEW YORK. 
SECOND SERIES. 
VOL. XXXII.—NOVEMBER, 1861. 
NEW HAVEN: EDITORS. 
1861. 
PPh i 
PRINTED BY E. HAYES, 426 CHAPEL ST. 
