SENSE ORGANS AND BEHAVIOUR 



B 



87 



Fig. 47. The track followed by Hemiclepsis when placed at M, 

 the centre of a circular dish which was illuminated by a single 

 light source at A. In experiment (a) the light source was a 40 W 

 lamp, in (b) a 150 W lamp. S indicates searching movements and 

 is followed by the time in minutes for which the movements 

 were carried out. From Herter, 1936. 



