REACTIONS TO LIGHT IN PLANARIA MACULATA 89 
on (fig. 9, 1 and 3, W’), the animal proceeded for a certain dis- 
tance at right angles to the rays of light until a wandering reflex 
caused the animal to turn far enough toward the light to allow 
the rays of light to enter the remaining eye. After this occurred 
the animal oriented accurately by describing a small circular 
path away from the light. In another case when the ‘blind’ 
Fig. 9 Camera-lucida drawing of path of specimen with the right eye removed 
in a horizontal beam of light. Arrows 1 to 9 indicate successive directions 
of the rays of light. C-E, path of specimen; N, direct orientation following il- 
lumination of the left, i.e., normal side; 7, orientation by means of the twisting 
reflex following illumination of the right, i.e., ‘blind’ side; w, orientation by 
means of the wandering reflex following illumination of the ‘blind’ side; w’, ori- 
entation by means of ‘wandering reflex’ modified by a greater rapidity in the 
movement of the animal. 
