TRANSACTIONS 



OF TI1K 



AMEKICAN PHILOSOPHICAL SOCIETY 



HELD AT PHILADELPHIA, 



FOR PROMOTING USEFUL KNOWLEDGE. 



VOL. X.— NEW SERIES. 



PUBLISHED 13 V T II I' ■-" <) (' I I. T V 



1) h f I a r I p h I a : 

 WILLIAM 8. YOUNG, PRINTEB^-NO. 60 NORTE BETH STREET. 



is:,; 



