36 C. H. TURNER. 



a lamp of a different candle-power had no disturbing effect upon 

 the actions of the ants ; but that by any marked change in the 

 angular position of the light, no matter what the candle-power, 

 the ants were much disturbed. This forces us to the conclusion 

 that the direction of the rays of light, when present, plays a 

 prominent role in the home-going of ants. 



ZOOLOGICAL LABORATORY, 

 UNIVERSITY OF CHICAGO, 

 November 10, 1906. 



