314 Journal of Comparative Neurology and Psychology. 



comically with that assumed when the light is in the rear. By- 

 moving the light around the animal in a circle all combinations 

 of lateral and longitudinal swaying movements may be produc- 

 ed, the body following the light by twisting about in a most 

 curious fashion. With the light to the right and behind the 

 animal the body is raised up in front, tilted over to the right, 

 the legs on the right side flexed and those of the opposite side 

 extended, the head turned to the right and the beak held high 

 in the air. If the light is passed in front of the animal on the 

 left side the head and body are both bowed down and tilted to 

 the left, the left legs flexed and the right ones thrown in a state 

 of extension. As with the head, so with the body, there is a 

 certain attitude assumed for each particular position of the light. 



^/[g'. 2. The lower figure represents the position of Ranatra when the light 

 is behind the body. The upper figure represents the position assumed when the 

 light comes from in front. 



Ranatras may be made to follow the light in any direction 

 in the most slavish manner. By keeping the light to one side 

 and a little behind the middle of the body the animal may be 

 kept wheeling about in one spot, often, however, falling over 

 on one side in its eagerness to get around. One reason for its 

 awkwardness in this case is that as the light comes from the 



