FINDING THEIR WAY. 253 



I then varied the experiment as subjoined, and as 

 «hown in the woodcut (Fig. 13). 



Experiment 2. — I connected the table vdth the 

 nest by a paper bridge, the end of which is shown 

 at B (Fig. 13), and which came down about an inch 

 from the pole supporting the nest (see Fig. 1). This 

 pole rose 18 inches above the table. I then put the 

 glass tray (c) with larvae as before, 12 inches from 

 the base of the pole, and put an ant to the larvse. 

 When she had learnt her way I traced four of her 

 routes, as shown in the thin lines 1, 2, 3, 4. I then 

 on her next journey (5, thick white line), when she 

 was on the tray (c), moved it three inches to d, as 

 shown in the figure, and again traced her route. The 

 contrast is very striking between the relatively straight 

 thin white lines 1, 2, 3, 4 of the four journeys when 

 familiar with the road ; whereas in the broad white line 

 No. 5 the zigzag twistings show how much difficulty 

 the ant experienced in finding her way. When she re- 

 turned I again moved the tray as before, and the dotted 

 sinuous white line (6) shows the course she followed. 



Experiment 3. — I then again varied the experi- 

 ment as follows : — I placed the larvse in a small china 

 cup on the top of the pencil, which thus formed a 

 column 7^ inches high. The cross line close to the 

 arrows (Fig. 14) is as before, the base of the paper bridge 

 leading to the nest, c shows the position of the penny 

 on which the pencil was supported. The dotted white 

 lines 1, 2, 3,4 show the routes of a marked ant on four 



