DISCRIMINATIVE ABILITY OF THE TURTLE 



15 



to profit by their experiences they received so large d, number 

 of shocks that they were rendered sulky and work with them 

 had to be discontinued. In several cases, as shown in table 6, 

 the white designs were placed on pendulums and caused to 

 swing slowly back and forth in front of the black boxes in the 

 hope that the moving object would attract and concentrate the 

 attention of the animal. As far as could be observed the results 

 were no more satisfactory. Preference tests were taken in all 

 cases and the electric shock administered for failure. As is 

 shown in tables 6 and 7 only negative results were obtained for 

 discrimination between the two patterns used. 



A 3 



Fig. Ill — Designs used in experiments on Pattern Discrimination. Reduced one-half 



TABLE 6 



Turtle No. 8, Pattern Discrim- 

 ination 



Result of preference trials: Pattern A, 



19; pattern B, 21. Fed in 



pattern A box 



Test. 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 



Test 



14. 

 15. 

 16. 

 17. 



18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 26. 

 27. 



Right Wrong 



6 4 



7 3 

 3 7 

 6 4 



Swinging pattern introduced. 

 4 



4 

 2 



7 

 7 

 7 

 1 

 7 

 7 

 6 



128 



6 

 6 

 8 

 3 

 3 

 3 

 9 

 3 

 3 

 4 



130 



