CLS^cjiLU^'^'^ 



SMITHSONIAN 



CONTRIBUTIONS TO KNOWLEDGE. 



YOL. X. 



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



KNOWLEDGE FOR MEN. — SmITHSON. 



CITY OF WASHINGTON: 



PUBLISHED BY THE SMITHSONIAN INSTITUTION. 



MDCCCLVIII. 



X 



