AMERICAN JOURNAL 



SCIENCE AND ARTS. 



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



JAMES D. DANA, 



PROF. ASA GRAY, of CAMBRIDGE, 

 PROF. LOUIS AGASSIZ, op CAMBRIDGE, 

 DR. WOLCOTT GIBBS, op NEW YORK. 



SECOND SERIES. 

 VOL. XXXIV.— NOVEMBER, 1862. 



