ACKNOWLEDGMENT

Among  the  sources  to  which  I  am  indebted  I  wish  to
acknowledge,  in  particular,  Mr.  L.  O.  Pethick,  whose  intimate ­
  knowledge  of  industrial  personnel  problems  contributed ­
  immeasurably  toward  making  these  applications
of  psychology  immediately  practical.  Among  psychologists, ­
  I  desire  to  express  my  thanks  above  all  to  Professors
E.  L.  Thorndike,  Roswell  P.  Angier,  H.  L.  Hollingworth,
  and  R.  M.  Elliott,  who  most  generously  gave  me
of  their  own  experience  and  knowledge.  For  the  index
and  other  valued  assistance  I  am  indebted  to  Miss  Sabina
Connolly.  Among  the  many  friends  and  colleagues  to
whom  I  am  grateful  for  very  helpful  cooperation  are  Mr.
John  L.  Koehne,  Miss  Marion  Gilbert,  and  Mr.  J.  H.  J.
Adams.  In  inscribing  this  book  to  my  wife  I  am  not  only
acknowledging  a  source  of  inspiration,  but  am  faintly  expressing ­
  my  gratitude  for  her  constant  help  in  preparing
the  manuscript  for  publication.

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