WluiELM  WtrNDT.  Ucher  psijchologische  Methoden.  Wundfs
Phil.  Studieu.     Bd.  I.  1882;  8.  1.
Wundt  here  complains  that  Vierordt's  experiments  unwar-
rantably complicate  the  time  judgments  with  voluntary  mus-
cular movements ;  that  is  those  used  in  reproduction ;  also
that  the  indefinite  pause  introduced  between  the  norm  and  the
reproduction  In  many  of  the  experiments  caosea  an  indefi-
nite break  in  the  rhythm,  which  must  disturb  judgment  with
great  irregularity.  Wundt  claims  that  the  time-sense  is  so
extremely  delicat*  that  the  apparatus  used  by  Vierordt  as
well  as  his  method  of  Kight  and  Wrong  Cases,  can  give  no  re-
liable results.  Wundt  recommends  his  own  method  of  Least
Perceivable  Diflerence.
JuLJUS    KoLi-EHT.      UnieTsuchungen     iiber   den    ZeitHnn.
Wundt's  Phil.  Stndien.  Bd.  I.  1882 ;  S.  78.
This  work  was  done  under  the  direction  of  Prof.  Wandt
at  Leipzig.  Purpose:  To  reinvestigate  the  Constant  Error
and  SeuKibility.  with  more  nc^'untte  apparatus  ami  method,
and  particularly  without  involving  ^e  time-reaction  of  re-
production. Apparafus:  Two  flneJy  adjusted  metronomes,
governed  by  electric  current  and  magnets.  Experimeni :  In
all  cases  the  norm  was  given  by  two  beats  from  one  metro-
nome, then,  after  a  pause  invariably  e<iual  to  the  norm,
another  interval  was  given  by  two  Iwatw  from  the  other  me-
tronome; these  two  intervals  to  l»«  judged  according  to
Wundt's  method  of  Least  Perceivable  DifterentTe,  that  is,  the
oompiired  int^-Tval  waM  first  made  e(]ual  to  the  norm,  then
gnuluully  lengthened  till  it  was  just  i>erccived  to  be  longer
than  the  norm ;  next  the  compared  interval  was  made  marked-


608


inoHOLs:


1y  longer  then  the  norm,  then  gradnally  aborter  till  jnst  indis*
tdn^iiKhahle  from  the  norm ;  the  average  was  then  taken  of
these  two  judgments  ju.st  perceivably  longer  than  the  norm.
