vi PREFACTORY NOTE 



As for Hans himself, he has become the prototype of a 

 host of less distinguished imitators representing every 

 level of animal life, and when last heard from he was still 

 entertaining mystified audiences by his accomplishments. 



But the permanent worth of the book is not to be found 

 in its record of popular excitement, interesting as that is. 

 It is a document of the very first consequence in its revela- 

 tion of the workings of the animal mind as disclosed in the 

 horse. Animal lovers of all kinds, whether scientists or 

 laymen, will find in it material of greatest value for the 

 correct apprehension of animal behavior. Moreover, it 

 afiFords an illuminating insight into the technique of ex- 

 perimental psychology in its study both of human and ani- 

 mal consciousness. Finally, it contains a number of 

 highly suggestive observations bearing on certain aspects 

 of telepathy and muscle-reading. All things considered, it 

 may fairly be said that few scientific books appeal to so 

 various a range of interests in so vital a way.. 



Readers who wish to inform themselves of all the per- 

 sonal circumstances in the case may best read the text 

 just as it stands. Those who desire to get at the pith of 

 the matter without reference to its historical settings, may 

 be advised to omit the Introduction by Professor Stumpf 

 of the University of Berlin, together with supplements 

 II, III and IV. 



