^oo L. 



ADVERTISEMENT 



The present series, entitled " Smithsonian Miscellaneous Collec- 

 tions ", IS intended to embrace all the octavo publications of the In- 

 stitution, 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, bibliography, geology, min- 

 eralogy, 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 impor- 

 tant additions to knowledge. 



C. G. Abbot, 

 Secretary of the Smithsonian Institution. 



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