374 



EXPERIMENTS ON CO-OPERATION. 



At 3.31 

 .3.36 



— returned again and took another. 

 3.34 



At 4.10 another ant came to the middle cup. 1 

 imprisoned her. 



returned again and took another. 



After this they were not watched any more. It will 

 be observed that the second ant made many more visits 

 than the first — namely, forty-two in about eleven hours, 

 as against twenty-six in eleven hours and a half. 

 During this time two ants came to the larvae in the 

 cup they were visiting, and three to the other two cups. 



The following case is still more striking. On July 

 11, 1875, at 1 1 A.M., I put a Lashes fiavus to some pupfe 

 of the same species, but from a different nest. She made 

 eighty-six journeys, each time carrying off a pupa with 

 the following intervals. Commencing — 



