424 C. H. TURNER 



presented to a nymph in forceps. After the insect had secured 

 a hold, the foiceps were gently withdrawn, thus inducing the 

 nymph to follow. Later, a piece of alga was held near the 

 nymph and, when the hungry creature attempted to secure the 

 food, the forceps were gradually withdrawn. This caused the 

 insect to follow the food. After being subjected for four weeks 

 to such experimenting, many of the nymphs learned to swim 

 consideiable distances towards the food, and some would even 

 swim towards the investigator if he made his appearance at 

 one end of the aquarium when they were at the other. After 

 two and a half months of such experience as soon as the experi- 

 menter appeared, the majority of the nymphs would swim 

 towards him and claw r against the side of the aquarium, and 

 one nymph would even climb a stone and reach up into the 

 air after food. Untrained nymphs never behaved in this man- 

 ner. Wodsedalek teels that these three types of experiments 

 demonstrate (i) that nymphs can be trained to respond posi- 

 tively to objects even in a lighted environment, (2) that. they 

 can learn giadually to inhibit their usual negative responses to 

 light and proportionately reintorce their reaction to an object 

 against the rays of light and in the presence of that object, 

 and (3) that they can learn to associate the investigator's pres- 

 ence with food. 



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