iv  PREFATORY  NOTE
In  the  collection  of  material  the  author  has
made  numerous  calls  upon  the  officials  of  the
Postal  Savings  Division  of  the  Post  Office  Department ­
  at  Washington,  and  wishes  here  to
express  his  gratitude  for  the  generous  and  courteous ­
  assistance  which  these  officials  have  given
by  furnishing  information  from  theii  unusually ­
  well  kept  records.  In  this  connection  the
author  wishes  particularly  to  express  his  gratitude ­
  to  Third  Assistant  Postmaster-General
Alexander  M.  Dockery;  Director  of  Postal  Savings ­
  Carter  B.  Keene;  and  Assistant  Director  of
Postal  Savings  Charles  H.  Fullaway.  To  his
colleague,  Professor  Neil  Carothers,  the  author  is
greatly  indebted  for  the  laborious  work  of  preparing ­
  the  table  of  contents  and  the  index  and
for  valuable  assistance  in  connection  with  the
reading  of  proof.
Princeton  University,
July  6,  1917.