'7' 



PKOCEEDINGS 



AMERICAN PHILOSOPinCAL SOCIETY 



HELD AT PHILADELPHIA 



PROMOTING USEFUL KNOWLEDGE 



Vol. XV. 

 DECEMBER mQ. 



No. 96. 



PHILADELPHIA: 

 PRINTED FOR THE SOCIETY 



BY M'GALIiA & STAVELY. 

 <fl)'^ 1876. 



