AMERICAN JOURNAL 
SCIENCE AND ARTS. 
CONDUCTED BY 
Prorzessors B. SILLIMAN, B. SILLIMAN, Jr., 
AND 
JAMES D. DANA. 
AIDED BY 
De. WOLCOTT GIBBS, or New York, 
IN PHYSICS AND CHEMISTRY, 
AND 
Pror. ASA GRAY, or CaMBRIDGE, 
IN BOTANY. 
SECOND SERIES. 8 
Le 
VOL. XV.=MAY,1853. * 
WITH A MAP AND TWO PLATES. 
NEW HAVEN: 
P UBLISHEDZRE) SSP 
Printed by wee A to NByyte 
DEC 1 1946 
oe we ee : 
Qi0en isa 
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