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TRANSACTIONS 



OF THE 



AMERICAN PHILOSOPHICAL SOCIETY, 



HELD AT PHILADELPHIA, 



FOR PROMOTING USEFUL KNOWLEDGE. 



VOL. VL— NEW SERIES. 



PUBLISHED BY THE SOCIETY. 



J3fvtlalrel|)hfa: 



PRINTED BY JAMES KAY, JUN. & BROTHER, PRINTERS TO THE SOCIETY. 



No. 122, Chestnut Street. 



1839 



/f0^^'M^ 



