AMERICAN JOURNAL 
OF 
SCIENCE AND ARTS. 
CONDUCTED BY 
PROFESSOR SILLIMAN 
AND 
BENJAMIN SILLIMAN, Jr. 
VOL. XLIIL—No. 2.—OCTOBER, 1842. 
FOR JULY, AUGUST, AND SEPTEMBER, 1842. 
(TO BE CONTINUED QUARTERLY.) 
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<i 
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