4 J. E. WODSEDALEK 



Normally the nymph is decidedly negative in its phototactic 

 response. Fifteen specimens were used, one after another, begin- 

 ning with the stone one inch away from the opening of the 

 small glass tumid, on the side toward the light, and then in- 

 creasing the distance until all of the nymphs reacted negatively. 



Mere again, we have considerable variation, as is shown in 

 table II. For example, all of the 15 specimens went toward 

 the stone, against the light, when it was between one and two 

 inches away from the opening of the tunnel, and when it was 

 between three and four inches away only about half of them 

 went toward it, while, when the stone was placed six inches 

 away, all of the specimens went in the opposite direction. 



The uniformity manifested by the nymphs in their negative 

 response to light when no objects are present, and the obvious 

 variations evinced in their reactions to objects in an evenly 

 lighted environment and also in their reactions to objects against 

 the rays of light, seem to suggest that the specimens going the 

 greatest distance toward the objects have learned to do so 

 through experience in their natural environment. 



TABLE II 



Variations Among Nymphs in their Response to Objects Against the 



Rays of Light 



In order to ascertain whether the reactions to objects are 

 modified by experience, three of the nymphs having similar 



