260 



THE SENSE OF DIRECTION. 



Fi-. 21. 

 1 



// 



/Esn 



aoain, as shown in Fig. 22 ; she returned aft(>r the usual 



interyal, 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 ex- 

 periments were re- 

 peated more than once, 

 and always with simi- 

 lar results. I then 

 - varied matters by re- 

 moving the bricks, 

 which, however, did not 

 seem to make any dif- 

 ference to the ants. 



I then accustomed 

 some ants (Lasi MS ni- 



(jer) to go to and fro over a wooden bridge, 6,c (Fig. 23), 



to some food. 



Fig. 23. 

 I c 



Fig. 22. 

 5 



/ 





When they had got quite accustomed to the way, I 

 watched when an ant.was on the bridge and then turned 

 it. round, so that the end b was at c, and c at b. In 

 most cases the ant immediately turned round also ; but 

 even if she went on to b or c, as the case may b?, as 



