348 
Psyche 
[December 
Fig. 10. Influence of the alerting behavior of one single food finder ant. 
A. The alerting performances occurring only on the pathway (small dots). 
B. The alerting performances occurring at the entrances of the nest logs 
(large dots). The ants walking over the main bridge were counted 
in 2 min periods. 
back to that place. By means of the high tendency of tandem run- 
ning and attraction to agglomerations in the alerted colony, large 
numbers of newcomers follow to the goal. The stream of running 
ants which at first develops on the main bridge now more and more 
deflects to the food bridge by the accumulative efficiency of all proper- 
ties of recruitment. In summary, the multiple effects leading to 
buildup at the food source are: 
( I ) Increased running activity of workers due to the as yet uni- 
dentified alerting stimuli. 
