SMITHSONIAN 



CONTRIBUTIONS TO KNOWLEDGE, 



YOL. XYI. 



, ^pR 27 1926 -^1 



EVERT MAN IS A VALUABLE MEMBER OF SOCIETY, WHO, BY HIS OBSERVATIONS, RESEARCHES, AND EXPERIMENTS, PROCURES 



KNOWLEDGE FOR MEN. — SmITHSON. 



CITY OP WASHINGTON: 

 PUBLISHED BY THE SMITHSONIAN INSTITUTION. 



MDCCCLXS. 



