JOURNAL 



OF 



THE ACADEMY OF NATURAL SCIENCES 



OP 



PHILADELPHIA. 



VOL. YIIT. SECOND SERIES. 



u/ 



%20 



r 



PART lY. 



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^^. 



> 



PHILADELPHIA: 

 PRINTED FOR THE ACADEMY: 



Collins' PniNTiNG House, 705 Jayne Street. 

 18U-1881. 



