THE 
AMERICAN JOURNAL 
OF 
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, 
PROF. S. W. JOHNSON, or NEW HAVEN, 
PROF. GEO. J. BRUSH, or NEW HAVEN. 
SECOND SERIES. 
VOL. XXXV.—MAY, 1863. 
WITH A MAP. 
NEW HAVEN: EDITOR 
1863. 
BPP PAAR 
* PRINTED BY E. HAYES, 426 CHAPEL 8ST. 
