‘Vou. XVIII. SEPTEMBER, 1854. No. 53. 
_ Published the first day of every second month, price $5 per year. 

AMERICAN JOURNAL 

SCIENCE AND ARTS. 
PROFESSORS B. SILLIMAN, B. SILLIMAN, Jz, 
JAMES D. DANA, 

IN CONNECTION WITH 
PROF. ASA GRAY, or CAMBRIDGE, 
PROF. LOUIS AGASSIZ, or CAMBRIDGE, 
DR. WOLCOTT GIBBS, or NEW YORK. 
SECOND SERIES. 
No. 53.—-SEPTEMBER, ee a 

