22 



D. B. CASTEEL 



from food to electric box so that the turtle always had one box 

 similar to one in a previous series of tests. This arrangement 

 doubtless aided the turtle in maintaining a high average of 

 correct selections. The tests were carried no farther than the 

 2 mm. -3 mm. combination since it was felt that these lines 

 were sufficiently similar in width to indicate a high degree of 

 discriminative ability. The tabulated results of No. lo's tests 

 are found in table 10. 



TABLE 11 



Turtle No. 8, Discrimination 

 Between Lines of Dif- 

 ferent Width 



Lines on both boxes horizontal. 8mm. 

 lines on food box 



Lines Smm. and 2mm. wide 

 Test Right Wrong 



1 5 5 



2 7 3 



3 6 4 



4 3 7 



5 8 2 



6 6 4 



7 7 3 



8 7 3 



9 8 2 



10 14 6 



11 6 4 



12 9 1 



13 5 5 



14 8 2 



15 7 3 



16 9 1 



17 9 1 



18 10 



19 10 



20 10 



154 56 



TABLE 12 



Turtle No. 11, Discrimination 

 Between Lines of Dif- 

 ferent Width 



All lines horizontal. 2mm. lines on 

 food box 



Lines Smm. and 2mm 



Test Right Wrong 



1 6 4 



2 5 5 



3 4 6 



4 5 5 



5.... 9 1 



6 8 2 



7 8 2 



8 6 4 



9 8 2 



10 7 3 



11 6 4 



12 10 



13 7 3 



14 7 3 



15 9 1 



16 10 



17 10 



18 10 



135 45 



INCIDENTAL RESULTS 



As an aftermath to work on any problem in animal behavior, 

 whether under natural surroundings or experimental control, 

 there may always be gathered certain facts and conclusions not 

 primarily sought in the investigation, yet often bearing impor- 

 tant relations to it or yielding interesting data of a more general 

 character. Such results will now be noted. 



Individuality. My turtles exhibited distinct individual differences 



