396 EXPERIMENTS ON 



She returned at 7.17 



7.28 

 7.36 



7.45 

 7.50 



7.55 



8. 4 



7.27 another ant to larvae. 



7.38 „ m. 



7.51 



8. 6 ,, ,. 



8.11 



8.18 

 „ 8.25 



„ 8.30 



„ 8.35 



8.45 



8.46 

 Imprisoned her. 



In this experiment, then, the bridge over which the 

 marked ant passed to the larvae 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 larvae ; and it will be seen that, under 

 these circumstances, out of 41 ants which found their 

 way towards the larv^ as far as e, 14 only passed over 

 the bridge / to the larvae, while 27 went over the 

 bridge d io 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 

 larvae, 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. 



