SMITHSONIAN 



CONTRIBUTIONS TO KNOWLEDGE 



VOL. XXIII. 





[ 2^79 59 6 





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BTERY MAN IS A VALUABLE MEMBER OF SOCIETY, WHO, BY ni9 OBSERVATIONS, RESEAZOUES, AND EXPERI.MENTS, PROCUKES 



KNOWIEDGE FOR MEN. — SmITHSON. 



CITY OF WASHINGTON: 



PUBLISHED BY THE SMITHSONIAN INSTITUTION. 



MDCCCLXXXI. 



