ADVERTISEAIENT 



The present series, entitled " Smithsonian Miscellaneous Collec- 

 tions." is intended to embrace all the octavo publications of the 

 Institution, except the Annual Report. Its scope is not limited, and 

 the volumes thus far issued relate to nearly every branch of science. 

 Among these various subjects zoology, bibHography, geology, mineral- 

 ogy, anthropology, and astrophysics have predominated. 



The Institution also publishes a quarto series entitled " Smith- 

 sonian Contributions to Knowledge." It consists of memoirs based 

 on extended original investigations, which have resulted in important 

 additions to knowledge. 



C. G. Abbot, 

 Secretary of the Smithsonian Institution. 



(iii) 



