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 qtiite 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 I looked 



