LABORATORY TESTS 133 



The magnitude of these movements varies between J4 

 and 3 millimeters. The records of the subject whose 

 movements were most extensive, show an average of i^^ 

 millimeter (based on 50 tests), with a mean variation of 

 ^ millimeter. Lack of space precludes the reproduction 

 of more than three records. 



Figure 13 (von Allesch) shows the movement accom- 

 panying the thought of " up ", a slight raise of the head, 

 recorded in the fourth curve. (The thought of " down " 

 is accompanied by a corresponding downward move- 

 ment.) 



Figures 14 (von Allesch) and 15 (von Manteuffel) 

 illustrate the nod which is associated with the thought 

 of " yes " in the case of two subjects. It is essentially 

 the same in both: the head is lowered and then raised. 

 The first of the two subjects is more decidedly motor, 

 and his movements therefore were somewhat the more 

 extensive. In the case of the second subject the nod 

 proper is followed by another which is somewhat less 

 extensive. 



A number of other experiments were carried out which 

 corresponded with the color-selecting tests made upon 

 Hans. (Page 78.) Five sheets of white paper, J4 

 meter long and J4 meter wide, were arranged in a series 

 upon the floor, 34 meter apart. A dot marked the middle 

 of each. The experimenter stood at a distance of 7j4 

 meters and. directly opposite the middle' sheet. At about 

 Yi meter to the right or left of him stood the subject who 

 took the part of the " horse ". The problem of the ex- 

 perimenter was to indicate to the " horse " a certain one 

 of the five sheets, but without the use of word or gesture. 

 I at first undertook the role of " horse ", whereas the 

 others consecutively played the part of questioner. All 



