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  [Illustration: CLEVER HANS]




  CLEVER HANS

  (THE HORSE OF MR. VON OSTEN)

  _A CONTRIBUTION TO EXPERIMENTAL
  ANIMAL AND HUMAN
  PSYCHOLOGY_

  BY
  OSKAR PFUNGST

  WITH AN INTRODUCTION BY PROF. C. STUMPF,
  AND ONE ILLUSTRATION AND FIFTEEN FIGURES

  TRANSLATED FROM THE GERMAN
  BY
  CARL L. RAHN
  _Fellow in Psychology in the University of Chicago_

  WITH A PREFATORY NOTE BY
  JAMES R. ANGELL
  _Professor of Psychology in the University of Chicago_

  [Illustration]

  NEW YORK
  HENRY HOLT AND COMPANY
  1911




  COPYRIGHT, 1911,
  BY
  HENRY HOLT AND COMPANY




PREFATORY NOTE

[BY JAMES R. ANGELL]

_The University of Chicago_


It gives me great pleasure to accept the invitation of the publishers to
write a word of introduction for Mr. Rahn's excellent translation of
"Der Kluge Hans", a book which in the original has been but little known
to American readers. The present wave of interest in animal life and
behavior renders its appearance peculiarly appropriate.

No more remarkable tale of credulity founded on unconscious deceit was
ever told, and were it offered as fiction, it would take high rank as a
work of imagination. Being in reality a record of sober fact, it verges
on the miraculous. After reading Mr. Pfungst's story one can quite
understand how sedate and sober Germany was for months thrown into a
turmoil of newspaper debate, which for intensity and range of feeling
finds its only parallel in a heated political campaign. That the subject
of the controversy was the alleged ability