REACTIONS TO LIGHT IN PLANARIA MACULATA 73 
effect of changes in the direction of illumination and the reactions 
of planaria were made. All of these are essentially the same as 
the one reproduced in figure 4. Moreover, the process of orient- 
ation was observed on many other occasions and it was found 
E 
Fig. 4 Camera-lucida drawing of the path of a Planarian, showing the rela- 
tion between changes in the direction of illumination and the direction of locomo- 
tion. C-E, path of specimen; R, point at which wandering reflex took place. 
Arrows 1 to 6 indicate successive directions of rays of light. Dotted lines extend- 
ing from the arrows 2 to 6 indicate the position of the planarian on its path when 
the direction of the rays was changed. 
