FINDING THEIR WAY. 253 
I then varied the experiment as subjoined, and as 
shown in the woodcut (Fig. 13). 
Experiment 2.—I connected the table with 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 (Cc) with larve as before, 12 inches from 
the base of the pole, and put an ant to the larve. 
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 J 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:—TI placed the larve in a small china 
cup on the top of the pencil, which thus formed a 
column 73 inches high. The cross line close to the 
arrows (Fig. 14) is as before, the base of the paper bridyre 
leading to the nest. 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 
