ANTS— SPECIAL SENSES. 
35 
white line represents the course then pursued by the ant 
in its endeavours to find the pencil, which was shifted only 
a few inches from A to B. That is, ‘ the ants on their 
journey to the shifted object travelled very often back- 
Fig. 2. 
wards and forwards and round the spot where the coveted 
object first stood. Then they would retrace their steps 
towards the nest, wander hither and thither from side to 
side between the nest and the point A, and only after 
very repeated efforts around the original site of the larvae 
reach, as it were, accidentally the object desired at B. 5 
Therefore the ants were clearly not guided by the sight 
of the pencil. 
The same thing is well shown by another form of 
experiment. 6 Some food was placed at the point a (Figs. 
3 and 4) on a board measuring 20 inches by 12 inches, 
