ADVERTISEMENT 



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 ever}^ branch of 

 science. Among these various subjects zoology, bibliography, geology, 

 mineralogy, 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) 



