TRANSACTION 



AMERICAN PHILOSOPHICAL SOCIETY, 



HELD AT PHILADELPHIA, 



FOR PROMOTING USEFUL KNOWLEDGE. 



VOL. XI II.— NEW SERIES. 



P U B L I S LI E D B Y T II B S O C I E T Y. 



ggftUaattpfeU: 



SHERMAN & CO., PRINTERS. 





1 8 6 9. 



