POWERS OF COMMUNICATION. 165 



been informed by A of the existence of the larvae, thej 

 found their way to them by tracking a's footsteps. If the 

 former, they would in any case pass over the bridge K 

 by whichever strip of paper it was constituted. On 

 the other hand, if they found the larvae by tracking, 

 then as the piece of paper by which A passed was 

 transferred to L, it would mislead them and carry them 

 away from the larvae to i. In every case, then, I trans- 

 posed the two papers forming the little bridges as 

 soon as the ant a had crossed over K and L. 



I put her (November 7, 1875) to the larvae on F 

 at 6.15 A.M. After examining them carefully, she re- 

 turned to the nest at 6.34. No other ants were out ; 

 but she at once reappeared with four friends and 

 reached the larvae at 6.38. None of her friends, how- 

 ever, crossed the bridge ; they went on to D, wandered 

 about, and returned home, a returned to the larvae at 

 6.47, this time with one friend, who also went on to d 

 and returned without finding the larvae. 



