SMITHSONIAN 



CONTRIBUTIONS TO KNOWLEDGE 



VOL. XXXIII 



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



KNOWLEDGE FOR MEN.— SMITHSON. 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



1904 



