ADVERTISEMENT 
The  Smithsonian  Miscellaneous  Collections  series  contains,  since  the 
suspension  in  1916  of  the  Smithsonian  Contributions  to  Knowledge, 
all  the  publications  of  the  Institution  except  the  Annual  Report,  the 
annual  pamphlet  describing  the  Institution's  field-work,  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. 
C.  G.  Abbot, 
Secretary  of  the  Smithsonian  Institution. 
(iii) 
