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HAROLD C. BINGHAM 



that flicker stimuli have a greater stimulating value for the 

 chick than spatial stimuli. The perception of movement offers 

 a most promising field for subsequent study of vision in animals. 



It seems probable that we shall find in birds considerable 

 acuity for moving stimuli. 



In studies of the chick's vision, prior to the investigation 

 of spatial perception which has been reported in the preceding 



