BEHAVIOUR 



99 



course came to approach that of a normal bee with both 

 eyes in use (Fig. 31). Through a number of trials some of 

 these insects were observed gradually to reduce the number 



Fig. 31. — /, ni, two trails of a Honey Bee with right eye obscured ; 

 n, 0, two trails of a Bee with left eye obscured, showing tendency to turn 

 constantly towards the side of the functional eye. p, r, two trails of a 

 Bee with left eye obscured, which behaved as a normal insect approach- 

 ing the source of light. After D. E. Minnich {Jotirn. Exper. Zool. xxix, 

 1919). 



In Figs. 30 and 31 the small circle represents the source of light and 

 the thin straight line the direction of the rays. 



and frequency of their *' circus " movements, until after 

 twelve or twenty trials, they made for the source of light in 



