TRANSACTIONS 



OF THE 



AMERICAN 



PHILOSOPHICAL SOCIETY, 



HELD AT 



PHILADELPHIA, 



FOR PROMOTING 



USEFUL KNOWLEDGE. 



VOLUME VI— PART I. 



PHILADELPHIA: 



PROM THE PRESS OF THE LATE R. AITKEN. 



BY JAKE AITKEW, No. 20, NORTH T xlRD STREET. 



180*. 



