332 J. D. DODSON 



to tend to establish in the animal the habit of escaping. During 

 this preliminary work I shifted the cardboard from side to side 

 to determine whether or not the kitten had any preference for 

 the light or dark box and found no preference shown. 



The difference in the amount of light entering the two electric 

 boxes was that which would pass through an opening in the cover 

 23.5 by 13 cm. Of this opening 16 by 13 cm. was over the plat- 

 form which was 12 cm.' below the top of the box. For the 

 medium stimulus a current with a voltage of 19.5 and an am- 

 perage of 2.5 was run through an inductorium with a coil set 

 3.6 cm. from the closed end. For the strong stimulus a 

 current was used with the voltage and the inductorium the 

 same as for the medium stimulus but the amperage was 3.5. 



Results of experiments of set 1. Tables 1 and 2 show detailed 

 results of set 1 . At the top of each table are given the numbers 

 of the kittens which were used under the conditions named 

 in the heading of the table. The first column gives the number 

 series; the other columns give the number of errors and the 

 average of errors made by male and female and also the general 

 average; while the last line gives the total number of trials 

 and their average for perfecting the habit. 



TABLE 1 



The Results of Experiments of Set I, Medium Stimulus 



(Volt. 19.5, Amp. 2.5) 



Males Females 



General 



Series No. 1 No. 5 Average No. 2 No. 6 Average Average 



1 6 4 5 7 4 5.5 5.25 



2 2 2 2 2 3 2.5 2.25 



3 4 2 3 6 4 5 4 



4 4 2 3 4 3 3.5 3.25 



5 13 2 1 2 1.5 1.75 



6 4 2 1 2 1.5 1.75 



7 1 1 1 2 1 1 



8 11 1 1 2 1.5 1.25 



9 3 1.5 0.75 



10 



11 0' 



12 



Total No. of trials. .. . 80 80 80 80 90 85 82.5 



