SMITHSONIAN 



TTAIVK 



VOL. XXIX. 



'EVERY MAN IS A VALVABLE MEMBER OF SOCIK.TY WHO BY HIS OBSERVATIONS, RESEARCHES, 

 AND EXPERIMENTS PROCURES KNOWLEDGE FOR MEN." — SMITHSON. 



WASHINGTON: 

 PUBLISHED BY THE SMITHSONIAN INSTITUTION. 



1887. 



