Washburn and Bentley, Color-Discrimination. 123 



sank, rose to the red without biting, and went down again. 



And 



on August 17 there still remained a tendency to bite first at the red 

 when both forceps were empty. Also, we observed, at this time, 

 that the biting movements were made less at random than before, 

 that they were aimed less at the sticks and more definitely at the 

 bait; that there was, in other words, a more precise and delicate 

 adjustment to the food-situation. 



TABLE II. FOOD IN GREEN FORCEPS. 



Another factor, without perceptible efi^ect when the connection 

 between a given color and the impulse to bite was fully established, 

 seems to have had some influence, for a time, during the breaking 

 up of the association, "red-food," and the formation of the asso- 

 ciation, "green-food." This influence, which appeared about the 

 middle of the process, when we may suppose the tendencies to 

 have been about equally balanced, consisted in the position of the 

 fork with reference to the fish's entrance. If these "food-in- 

 green" experiments be divided into three groups, with regard to 

 the temporal order of their performance, the proportion of right 

 cases, I. e., where the green was bitten at first, is for the first third, 

 comprising twenty-three experiments, 52 per cent. The wrong 

 cases are 48 per cent., of the total number. Of the right cases, 

 58 per cent, occurred when the fish came up on the same side as 

 the correct fork; 42 per cent, when it came up on the opposite side. 

 Of the wrong cases, 45 per cent, occurred when it came up on the 

 same side, 45 per cent, for the opposite side, and in 10 per cent. 



