338 RECOGNITION OF FRIENDS 
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 anda 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 11 the friend was 
