SMITHSONIAN 



CONTRIBUTIONS TO KNOWLEDGE 



VOL. XXVI. 



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

 EXPERIMENTS, PROCURES KNOWLEDGE FOR MEN." SMITHSON. 



CITY OF WASHSraTON: 



PUBLISHED BY THE SMITHSONIAN INSTITUTION. 



1890. 



