SMITHSONIAN 



CONTRIBUTIONS TO KNOWLEDGE. 



VOL. X IX. 



TBT HA> II A TALUABLI MEMBER Of IOCIITT, WHO, BT IMS OBSBBVATIO!I, BEKEABORBI, AD EXPERIHEKTfl, PBOCI'REg 



ESOWLEDQE FOB HEX. SMITII3OIC. 



CITY OF WASHINGTON: 

 PUBLIS-RKD BY THE SMITHSONIAN INSTITUTION. 



MDCCCLXXIV. 



