340 RECOGNITION OF FRIENDS AFTER A 
and a stranger. The friend was not attacked, and con- 
sorted peaceably with the rest. I found her again all 
right on the following morning. The stranger, on the 
contrary, was soon attacked and expelled. 
December 22.—Repeated the same experiment, 
The stranger was attacked and driven out of the nest. 
The friend was received quite amicably. 
December 26.—Ditto. The friend was received as 
usual. I lost sight of the stranger, who probably escaped. 
December 31.—Ditto. The stranger, after being 
dragged about, some time in the nest, made her 
escape. But even outside, having met with an ant 
accidentally, she was viciously attacked. 
January 15, 1877.—Ditto. 
January 16.—I put in two friends; but thinking 
the preceding experiments sufficient, I did not on this 
occasion add a stranger. Neither of the friends was 
attacked. 
January 19.—Put in two friends at 11 a.m. 
Neither was attacked, and the following morning they 
were all right amongst the rest. 
January 22.—Put in three friends with the same 
result. 
January 24.—Put in two friends with the same 
result. 
January 26.—Put in three friends with the same 
result. 
February 11.—I put in two friends from the other 
division at 10 a.m. I looked at 10.15, 10.30, 11, 
11.30, 12, 2, 4, and 6 p.m. They were on every occa- 
sion quite at home amongst the others. 
February 12.—Put in three from the other division 
at 12. They were quite at home. I looked at them 
at 12.30, 1, 2,4, and 6. Only for a minute or two at 
first one appeared to be threatened. 
February 13.—Put in one friend from the other 
division. The ant was put in at 9.15 a.m., and visited 
