EXPERIMENTS WITH HOODWINKED ANTS. 209 



The esculine and cobalt were once more transposed, 

 and at 3.13 there were — 



Under the cobalt. Under the esculine. 



3 varnished. H varnished. 



1 normal. 13 normal. 



Thus the number of ants which followed the esculine 

 and moved from one half of the box to the other at 

 each transposition of the esculine and cobalt, was as 

 follows : — 



6 40 



And the number remaining under the cobalt and 

 esculine respectively was — 



28 9 30 49 



These experiments clearly showed that, while tlie 

 normal ants moved from side to side so as to be under 

 the esculine and consequently protected from the ultra- 

 violet rays, those in which the eyes had been varnished 

 remained unaffected by the transposition of the esculine 

 and the cobalt, showing that the difference was per- 

 ceived, not by the general surface of the skin, but by 

 the eyes, and that when these were covered the ants 

 were unaffected by the change. 



P 



