MAY, 1855. oe No. 57. 
Published the first day of every second month, price $5 per year. 
THE 
AMERICAN JOURNAL 
OF 
SCIENCE AND ARTS. 
CONDUCTED BY it 
PROFESSORS B. SILLIMAN, B. SILLIMAN, Jz, , 
AND 
JAMES D. DANA, 
IN CONNECTION WITH 
PROF, ASA GRAY, oF CAMBRIDGE, 
PROF. LOUIS AGASSIZ, or CAMBRIDGE, _ 
‘DR. WOLCOTT GIBBS, OF NEW" YORK. 
SECOND SERIES. 
a. Eames 1855. oo 
