By Sir John LuhbocJc, Bart. 53 



4th, 1875, 'till May 14th, 1877, when the last ones were restored to 



their friends. 



Though the above experiment seemed to me conclusive, I thought 



it would be well to repeat it with another nest. 



I therefore separated a nest of Formica fusca into two portions on 



the JJOth October, 1876, and kept them entirely separate. 



On the 25th February, 1877, at 8, a.m., I put an ant from the 

 smaller lot back among her old companions. At 8.30 she 

 was quite comfortably established among them. At 9, ditta. 

 At VI, ditto, and at 4, ditto. 



June 8th. I put two specimens from the smaller lot back, as before 

 among their old friends. At 1, they were all right among 

 the others. At '2, ditto. After this I could not distinguish 

 them among the rest, but they were certainly not attacked. 



June 9th. Put in two more at the same hour. Up to 3 in the 

 afternoon they were neither of them attacked. On the con- 

 trary, two strangers from different nests, which I introduced 

 at the same time, were both very soon attacked. 



July 14th. I put in two more of the friends at 10.15. In a few 

 minutes they joined the others and seemed quite at home. 

 At 11, they were among the others; at 12, ditto; and at 1, 

 ditto. 



July 21st. At 10.15, I put in two more of the old friends. At 

 10.30, neither were being attacked. At 11, ditto. 12, ditto. 

 2, ditto. 4, ditto. 6, ditto. 



October 7th. At 9.30, I put in two and watched them carefully till 

 1. They joined the other ants, and were not attacked. I 

 also put in a stranger from another nest. Her behaviour 

 was quite different. She kept away from the rest, running 

 off at once in evident fear, and kept wandering about, seeking 

 to escape. At 10.30, she got out. I put her back, but she 

 soon escaped again. I then put in another stranger. She 

 was almost immediately attacked. In the meantime the 

 old friends were gradually cleaned. At 1.30, they could 

 scarcely be distinguished. They seemed quite at home, while 

 the stranger was being dragged about. After 2, I could no 



