LABORATORY TESTS 131 



thought of the number 4, but it is hardly probable that 

 Hans would have reacted properly upon these stimuli. 

 Mr. Schillings had thought of the same number in all 

 three tests given in figures 10, 11 and 12. The prob- 

 abilities are that if he had been working with the horse 

 at the time, in the first case Hans would have reacted 

 with three taps with the right foot and a final tap with the 

 left, as a result of the questioner's bending forward again 

 after the premature head- jerk at 3. In the second in- 



FlG. 12. 



Stance the horse would probably have given four taps 

 with the right foot, and in the third, the chances are that 

 he would have continued to tap beyond the 4. 



These curves give, on the v^hole, a fair idea of the in- 

 tensity and of the course of attention of the various 

 subjects. 



Let us now consider a number of records which illus- 

 trate the expressive movements involved in the process 

 of thinking of such concepts as " up ", " down ", etc. 



