1\1- 



14 



22 



11 



23 



lu 



26 



27 



IS 



28 



30 



12 



32 



."« 



33 



Figs. 22 to 33 Diagrams illustrating the approximate courses taken by Calil- 

 phora larvae in response to the various pairs of monochromatic lights: 



Fig. 22 Red-blue Fig. 26 Red-yellow Fig. 30 Yellow-green 



Fig. 23 Blue-red Fig. 27 Yellow-red Fig. 31 Green-yellow 



Fig. 24 Red-green Fig. 28 Yellow-blue Fig. 32 Green-blue 



lig. 25 Green-red Fig. 29 Blue-yellow Fig. 33 Blue-green 



