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. Kepeated 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 I looked 



