338 EECOGNITION OF FEIENDS 



change. I then opened the door of the nest soon after 

 5 P.M. ; but she showed no wish to leave her newly re- 

 joined friends. 



September 1. — At 11 a.m. I again put into each half 

 of the nest an ant from the other and a stranger. In 

 the one nest the friend joined the other ants, and seemed 

 quite at home ; the stranger, on the contrary, en- 

 deavoured to conceal herself, and at length, at 4 in the 

 afternoon, escaped from the nest. 



In the other division the friend also appeared quite 

 at home. The stranger, on the contrary, endeavoured 

 to escape, but in the course of the afternoon was 

 attacked and killed. 



October 15. — At 8 a.m. I repeated the same experi- 

 ment. In the first nest, up to 10 a.m., neither ant was 

 attacked ; and it is curious that the stranger was licked, 

 and, indeed, almost cleaned. Soon afterwards, however, 

 the ants began to attack her, and at three p.m. she was 

 expelled, the friend, on the contrary, being quite at 

 home. Still the following day, at noon, I found her out 

 of the nest (all the rest being within). This almost 

 looks as if, though safe, she did not feel happy ; and 

 I accordingly put her back to her old home, which 

 she at once entered. 



In the other division the friend was soon nearly 

 cleaned, and the stranger partly so. The friend seemed 

 quite at home. At 12.30 the stranger was being 

 dragged about by three ants ; but after this I lost sight 

 of her. 



November 10. — At 11.30 put into one of the divi- 

 sions a friend and a stranger. At 12 the friend was 

 all right, the stranger was being dragged about by an 

 antenna. From this time till 7 P.M. the stranger was 

 continually being dragged about or held a prisoner, 

 while the friend was quite at home. 



November 11. — At 10.15 I put into the other 

 division a friend and a stranger. At 1 1 the friend was 



