£ a 
Vou. XVIII. JULY, 1854. No. 52. 
ear 
Published the first day of every second month, price $5 per year. 
THE 
AMERICAN JOURNAL 
OF 
SCIENCE AND ARTS. 
CONDUCTED BY 
PROFESSORS B. SILLIMAN, B. SILLIMAN, Jin, 
AND 
JAMES D. DANA, 
IN CONNECTION WITH 
PROF. ASA GRAY, or CAMBRIDGE, 
PROF. LOUIS AGASSIZ, or CAMBRIDGE, 
DR. WALDO I. BURNETT, or BOSTON, 
DR. WOLCOTT GIBBS, or NEW YORK. 

SECOND SERIES. 
No. §2.—JULY, 1854. 
WITH A CHART. 




