DISCRIMINATIVE ABILITY OF THE TURTLE 19 



TABLE 9 



Turtle No. 4, Vertical and Hori- 

 zontal Line Discrimination 



Result of preference trials: Vertical 43, 

 horizontal 57. Fed in vertical box 



Lines Smm wide. Lines Amm. wide 



Test Right Wrong Test Right Wrong 



1 1 9 



2 1 9 



3 2 8 



4 4 6 



5 5 5 



6 5 5 



7 5 5 



8 5 5 



9 1 9 



10 2 8 



11 4 6 



12 1 9 



13 3 ,7 



14 5 5 



15 4 6 



16 5 5 



17 4 6 



18 8 7 



19 8 2 



20 6 4 



21 10 



22 10 10 



23 9 1 



24 5 5 



25 17 3 



26 15 5 



27 18 2 



28 19 1 



29 19 1 



30 9 1 



31 7 3 



32 17 3 



33 16 4 



34 9 1 



35 10 



36 10 



37 10 



289 166 



Group II 



While the results of the foregoing experiments indicate that 

 turtles can leam to discriminate between two series of lines 

 running in different directions, even though these lines are 

 reduced in width to but 2 mm., they do not necessarily show 

 that the turtles are able to discriminate between individual 



