372 EXPERIMENTS ON CO-OPERATION. 



They were tlien watched until a quarter to eight in the 

 evening, during which time one of them had made 

 twenty-six journeys, carrying off a larva each time ; the 

 other forty-two. During this period of about eleven 

 hours, two other ants had come to the cup at which 

 these were working, and the same number to one of the 

 other cups. 



None of these ants, therefore, though they had found 

 a large number of larvae, more than they could carry in a 

 whole day, summoned any other to their assistance. 



Again, February 7, 1875, I put some larvae in three 

 porcelain cups in the feeding-box of a frame containing 

 a nest of Lasius fiavus, about six inches from the 

 entrance of the frame, and put, at 8 and 8.29 a.m. 

 respectively, two ants to the larvse in the left-hand 

 cup. They each carried off a larva and returned as 

 follows : — 



9.56 

 10.20 

 10.25 — 



At 10.43 another ant came to the larvse in the 

 right-hand cup. I imprisoned her. 



At 11. returned again and took another. 



11. 1 — 



11. 9 



11.15 — 



11.20 

 11.29 



