TKMSACTIONS 



OF THE 



AlEEICAN PHILOSOPHICAL SOCIETY, 



HELD AT PHILADELPHIA, 



FOR PROMOTING USEFUL KNOWLEDGE. 



VOL. VIIL— NEW SERIES. 



PUBLISHED BY THE SOCIETY. ^q'>^'»^' 





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PRINTED BY WILLIAM S. YOUNG,— NO. 88, NORTH SIXTH STREET. 



1843. 



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