GUIDED BY SIGHT. 273 



two. I then moved it to M". Two ants came together. 

 One found the pillar in 7 minutes ; the other took no 

 less than 25, although, as already mentioned, the table 

 was only 18 inches in diameter. Obviously, therefore, 

 though it seems clear that they are helped by sight, still 

 these last observations support those previously re- 

 corded, and show that in finding their way they do 

 not derive by any means so much assistance from their 

 eyes as we should under corresponding circumstances. 



