0' 



rfi 

 ii 

 in 



1:1 

 II 



30 ANIMAL INTELLIGENCE. 



and so arranged that the ants in going straight from it to 

 the nest would reach the board at the point b, and after 



passing under the paper 

 tunnel c, would proceed 

 between five pairs of 

 wooden bricks, each 3 

 inches in length and If 

 inches in height. When 

 they got to know their 

 way they went quite 

 straight along the line d e 

 Fig. 3. to a. The board was then 



twisted as shown in Fig. 4. ' The bricks and tunnel being 



arranged exactly in the 

 same direction as be- 

 fore, but the board 

 havingbeen moved, the 

 line d e was now out- 

 side them. The change, 

 however, did not at all 

 discompose the ants ; 

 but instead of going, 

 as before, through the 

 tunnel and between 

 the rows of bricks to 

 a, they walked exactly 

 Keeping the board steady, but 

 moving the brick pathway 

 to the left-hand corner of 

 the board where the food 

 was next placed (Fig. 5), 

 had the effect of making 

 the ant first go to the old 

 position of the food at rt, 

 whence it veered to a new 

 position, which we may 

 call x. The bricks and 

 food were then moved to- 

 wards the right-hand corner of the board i.e. over a dis- 

 tance of 8 inches (Fig. 6). The ant now first went to a, 



Fig. 4. 

 the old path to e.' 



