130 EXPERIMENTS WITH PUPiE. 



they would be amicably received in the nest from 

 which their nurses had been taken, but not in their 

 own. 



In the first place, therefore, I put, on September 2, 

 1877, same pupae from one of my nests of Formica 

 fusca with a couple of ants from the same nest. On 

 the 27th I put two of the ants, which in the meantime 

 had emerged from these pupae, back into their own 

 nest at 8.30 a.m., marking them with paint as usual. 

 At 9 they seemed quite at home ; at 9.30, ditto ; at 

 10, ditto; and they were nearly cleaned. After that 

 I could not distinguish them. 



On the 29th another ant came out of the pupa- 

 state ; and on October 1 at 7.45 I put her back into 

 the nest. She seemed quite at home, and the others 

 soon began to clean her. We watched her from time 

 to time, and she was not attacked ; but, the colour 

 being removed, we could not recognise her after 9.30. 



On July 14 last year (1878) I put into a small glass 

 some pupae from another nest of Formica fusca with 

 two friends. 



On August 111 put four of the young ants which 

 had emerged from these pupae into the nest. After 

 the interval of an hour, I looked for them in vain. 

 The door of the nest was closed with cotton-wool ; so 

 that they could not have come out ; and if any were 

 being attacked, I think we must have seen it. I 

 believe, therefore, that in the meantime they had been 

 eleaned. Still, as we did not actually watch them, I 



