

tei;:l?),,Jcms 



f'-Vw v. 



:V/ YORK. ^ 



OF THE 



ACADEMY OF NATURAL SCIENCES 



OF PHILADELPHIA 



VOL. YL 1^52, 1853. 



PHILADELPHIA. 



PRINTED FOR THE ACADEMY, 

 By Merrihew & Thompson, Merchant street, above Fourth, 



1854. 



