THE 



AMERICAN JOURNAL 



OF 



SCIENCE AND ARTS. 



CONDUCTED BY 



PROFESSORS B. SILLIMAN, B. SILLIMAN, Jr., 



AND " 



JAMES D. DANA, 



IN CONNECTION WITH 



PROF. ASA GRAY, of CAMBRIDGE, 

 PROF. LOUIS AGASSIZ, of CAMBRIDGE, 

 DR. WOLCOTT GIBBS, of NEW YORK. 



SECOND SERIE 



VOL. XXII. — NOVEMBER, 1856 



WITH THREE PLATES AND A MAP. 



NEW HAVEN: EDITORS. 

 NEW YORK: G. P. PUTNAM & CO. 



H. HAYES, PRINTER. 



