SMITHSONIAN 



CONTRIBUTIONS TO KNOWLEDGE. 



VOL. IX. 



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, J 



EVEUY MAN IS A VALUABLE MEMBER OF SOCIETY, WHO, BY HIS OBSERVATIONS, RESEARCHES, AND EXPERIMENTS, IHIOCL'RES 



KNOWLEDGE TOR MEN. — SmITHSON. 



CITY OF WASHINGTON: 



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MDCCCLVII. 



