'h -4 



TRANSACTIONS 



OF THE 



AMERICAN PHILOSOPHICAL SOCIETY, 



HELD AT PHILADELPHIA, 



FOR PROMOTING USEFUL KNOWLEDGE. 



VOL. VII.— NEW SERIES. 



V^-T. 



J 



PUBLISHED BY THE SOCIETY. 



i^fitlatreljjlita: 



PRINTED BY WILLIAM S. YOUNG, PRINTER TO THE SOCIETY, 

 No. 88, North Sixth Street, 



1841. 



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