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SMITHSONIAN 



CONTRIBUTIONS TO KNOWLEDGE. 



VOL. XII. 



ICVEUY MAN IS A VALUABLli MEMBER OF .SOCIETY, WUO, BY HIS OBSEllVATIONS, UE.SEARCIIES, AND EXPERIMENTS, PROCUKES 



KNOWLEDGE FOR MEN. — SmITHSON. 



CITY OF WASHINGTON: 

 PUBLISHED BY THE SIMITIISON I AN INSTITUTION. 



MDCCCLX. 



