42 



THE EYE IN EVOLUTION 



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PHOTOTAXIS 



A DIRECTED RESPONSE TO LIGHT is obviously a much more efficient 

 orientating mechanism than the simple change in activity we have 

 already discussed as photokinesis wherein a difference of intensity 

 serves as the stimulus and aggregation is determined, as it were, merely 

 by accident. The phototactic reaction is purposive ; for example, by 

 suitable manipulation of the lighting system it is possible to make 



