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- 



Fiff. 16. 



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 bj- 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 

 in 3 -^ 



ceding, the results of which are shown in the figures 

 16 and 17, seem to prove that this species of ant, at any 



