SIE JOHN LUI3B0CK ON ANTS, BEES, AND WASPS. 277 



the line de was now outside them. This 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 along the old 

 path to e. 



I then arranged mat- 

 ters as before, but with- 

 out the tunnel and with 

 only three pairs of bricks 



(fig. 3). When an ant had got quite used to the path d to e, 

 I altered the position of the 

 bricks and food to/ (fig. 4), 

 making a difference of 8 

 inches in the position of the 

 latter. The ant came as before, 

 walked up to the first brick, 

 touched it with her antennae, 

 but then followed her old 

 line to a. From there she 

 veered towards the food, and 

 verysoonfoundit. AVhenshe 

 was gone, I altered it agaic, 

 as shown in fig. 5 ; she re- 

 turned after the usual inter- 

 val, and went again straight 

 to a; then, after some 

 wanderings, to /, and at 

 length, but only after a lapse 

 of 25 minutes, found the 

 food at g. These experi- 

 ments were repeated more 

 than once, and always with 

 similar results. I then va- 

 ried matters by removing 

 the bricks, which, however, 

 did not seem to make anv 

 diff'erence to the ants. 



