PROCEEDINGS 



OF THE 



ACADIMY OF MTOAL SCIMCES 



OP 



PHILADELPHIA 



No. 5.— November and December, IS 68. 



PHILADELPHIA: 



ACADEMY OF NATURAL SCIENCES, 



Corner of Broad and Sansom Streets. 



1868. 



Merribew &, i^on, Printers, 243 Arch St., Philadelphia. 



