THE Vv. 4 
AMERICAN JOURNAL 
SCIENCE AND ARTS. 
CONDUCTED BY 
Prorressors B. SILLIMAN anv JAMES D. DANA, 
IN CONNECTION WITH 
Prorussors ASA GRAY, anv WOLCOTT GIBBS, 
or CAMBRIDGE, 
AND 
Proressors H. A. NEWTON, 8S. W. JOHNSON, 
GEO. J. BRUSH, anp A. E. VERRILL, 
or NEW HAVEN. 
SECOND SERIES. 
VOL. XLIX.—[WHOLE NUMBER, XCIX.] 
Nos. 145, 146, 147. 
AT 
J © 
een 
NEW HAVEN: EDITORS. 
1870. 
——oeeernr een 
PRINTED BY TUTTLE, MOREHOUSE & TAYLOR, 221 STATE ST. 
