

ADVERTISEMENT 



The Smithsonian Miscellaneous Collections series contains, since the 

 suspension in 191 6 of the Smithsonian Contributions to Knowledge, 

 all the publications issued directly by the Institution except the Annual 

 Report and occasional publications of a special nature. As the name 

 of the series implies, its scope is not limited, and the volumes thus far 

 issued relate to nearly every branch of science. Papers in the fields of 

 biology, geology, anthropology, and astrophysics have predominated. 



A. Wet MORE, 

 Secretary of tlie Smithsonian Institution. 



(tii) 



