SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE. 



241 



A CONTRIBUTION 



To run 



HISTORY OF THE FRESH-WATER KLGM 



or 



NORTH AMERICA. 



BY 



HORATIO C. WOOD, JR., M.D., 



rorOR or IOTAS T. AND CLINICAL LECTURER on DIIBAIBS or TIE HBBTODS ITSTIH in THE 

 UIIVEBSITT or PEXXIYLVAIIIA ; PBTIICIAIITO THE PHILADELPHIA BOIPITAL, ETC. 



[ACCIPTID FOB PDlLICATfO, PKBRPART, 172.J 



