372 EXPERIMENTS. ON CO-OPERATION. 
They were then 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 larve, more than they could carry in a 
whole day, summoned any other to their assistance. 
Again, February 7, 1875, I put some larvee in three 
porcelain cups in the feeding-box of a frame containing 
a nest of Lasius flavus, about six inches from the 
entrance of the frame, and put, at 8 and 8.29 a.m. 
respectively, two ants to the larve in the left-hand 
cup. They each carried off a larva and returned as 
follows :— 
No. 1. No. 2. 
At 8.35 — returned again and took another. 
9. 0 an ” ” 
9.7 ” ” 
9.20 » » 
9.30 =e 2” ” 
9.43 ” ” 
9.54 a ay ” 
9.56 » » 
10.20 % i 
10.25 —_ 
” ” 
At 10.43 another ant came to the larve in the 
right-hand cup. I imprisoned her. ; 
At 11. 0 returned again and took another. 
ll. 1 — 
11. 9 
11.15 —_— 
11.20 
11.29 
