396 EXPERIMENTS ON 
She returned at 7.17 
7.27 another ant to larve. 
7.28 
7.36 
7.38 ” mM. 
745 
7.50 
7.51 bed 3 
7.55 
7 8. 4 
7 8.11 
8.18 
8.25 
8.30 
- 8.35 
3 8.45 
5 8.46 
Imprisoned her. 
In this experiment, then, the bridge over which the 
marked ant passed to the larve was left in its place, 
the scent, however, being removed or obscured by the 
friction of my finger; on the other hand, the bridge 
had retained the scent, but was so placed as to lead 
away from the larve; and it will be seen that, under 
these circumstances, out of 41 ants which found their 
way towards the larve as far as e, 14 only passed over 
the bridge f to the larve, while 27 went over the 
bridge d to the empty glass m. 
Taking these observations as a whole, 150 ants 
came to the point e, of which 21 only went on to the 
larvee, while 95 went away to the empty glass. These 
experiments, therefore, seem to show that when an 
ant has discovered a store of food and others flock to 
it, they are guided in some cases by sight, while in 
others they track one another by scent. 
