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EMPLOYMENT  PSYCHOLOGY

certain  stated  times  for  examination,  know  to  their  regret
what  a  genuine  difficulty  this  is.  A  laboratory  stationed  in
the  immediate  vicinity  of  those  to  be  examined  makes  it
very  easy  to  get  the  right  subject  at  the  right  time,  and
saves  thereby  an  endless  amount  of  confusion  and  effort.
Thirdly,  a  stationary  laboratory,  with  its  pretentious  equipment ­
  and  its  striking  contrast  with  the  shops,  would  tend
to  upset  a  subject  who  knew  nothing  about  such  matters,
and  thereby  lessen  the  value  of  the  results  of  the  experiment. ­
  A  laboratory  set  up  in  the  shop  does  not  entirely
avoid  this  difficulty,  but  certainly  reduces  it  to  a  minimum-Finally,
  a  laboratory  of  this  kind  keeps  the  experimenter
in  the  shop  most  directly  affected,  and  no  condition  is
more  important  to  the  successful  conduct  of  an  experiment ­
  than  a  very  intimate  contact  with  the  ways  and
work  of  the  shop  in  which  it  is  being  conducted.