PHOTORECEPTION 



203 



200 



Log I (mlLLUamberts) 



Fig. 96. Relation between visual acuity and intensity of illumination 

 for the eye of the bee. (Redrawn from Hecht and Wolf, 1929.) 



Log I (tn'dULamberts) 

 A 



Log I (mUlUamberts) 

 B 



Fig. 97. Relation between visual acuity and illumination in bees in which 

 A, the central area of the eye has been opaqued; B, the anterior region 

 of the eye has been opaqued. The broken line represents the curve for 

 normal individuals. (Redrawn from Hecht and Wolf, 1929.) 



