THE 
AMERICAN JOURNAL 
SCIENCE AND ARTS. 
CONDUCTED BY 
Prorrssors B. SILLIMAN anno JAMES D. DANA, 
IN cones WiTH 
Proressors ASA GRAY, anp WOLCOTT GIBBS, 
or CAMBRIDGE, 
AND 
Prorressors H. A. NEWTON, 8. W. JOHNSON, 
GEO. J. BRUSH, anp A. E. VERRILL, 
or NEW HAVEN. 
SECOND SERIES. 
VOL. XLVIII.—[WHOLE NUMBER, XCVIII.] 
Nos. 142, 143, 144. 
el 
NEW HAVEN: EDITORS. 
1869. 
PRINTED BY TUTTLE, MOREHOUSE & TAYLOR, 221 STATE ST. 
