PROCEEDINGS 



OP THE 



ACADEMY OF NATURAL SCIlNCiS 



OP 



PHILADELPHIA 



No. 4.— Dece mber, 1869. 



PHILADELPHIA: 



ACADEMY OF NATURAL SCIENCES, 

 Corner of Broad and Sansom Streets. 

 1869. 



Merrihew & Son, Printers, 243 Arch tit., Philadelphia. 



