4 “SEPTEMBER, 1850. _ "No. 29: 
blished the Jirst day of every second month, price $5 per year. 
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AMERICAN JOURNAL 
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. SCIENCE AND ARTS. | 
CONDUCTED EY 
Proressons B. SILLIMAN) B. SILLIMAN, 
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ee JAMES D. DANA. a 
et AND : 
