256 SIGHT LITTLE USED 
on three other ants (see Figs. 15-17) with the same 
result: the second was 7 minutes before she found the 
pencil, and at last seemed to do so accidentally; the 
third actually wandered about for no less than half an 
hour (Fig. 15), returning up the paper bridge several 
times. 
Other experiments somewhat similar to the pre. 
Fig. i6. 
we 
Diagram representing three tracks of an ant in another experiment 
A, the first position of ~pencil and the food, towards which and 
from the base-line of nest 1 and 2.lead by nearly direct broadish 
white lines to A. When the latter was removed to B the ant, in its 
effort to reach this, pursued the narrow white winding line ending 
in3—7 
ceding, the results of which are shown in the figures 
'6 and 17, seem to prove that this species of ant, at any 
