SMITHSONIAN 



/i 



CONTRIBUTIONS TO KNOWLEDGE. 



VOL. IV. 



JITCKT MAN IS A VALUABLE KEKBEB OF SOCIETY, WHO, BY HIS OBSERVATIONS, BKSEABCHES, AND EXPEniMENTS, PROCUHKS 

 «  KNOWLEDGE FOB MEN. — SmITHSON. 



CITY OF WASHINGTON: 

 PUBLISHED BY THE SMIT H S ONI AN-'IN STITUTION. 



MDCCCIII. 



