FORMATION OF ASSOCIATIONS IN THE MAY-FLY 



9 



A glance at either table V or VI at once suggests a curve 

 representing the obvious intensification of the expression of 

 fear. The letters indicative of signs of fear first appear in great 

 numbers in the first column and later gradually make their 

 appearance in columns two and three which represent the more 

 obvious signs of agitation. All of the specimens, however, did 

 not behave in this manner. Some, from the very beginning, 

 would feign death when disturbed, while others reacted very 

 favorably for several weeks and then, on account of their death- 

 feigning propensity, which became more and more pronounced, 

 little could be done with them. 



TABLE V 



Fear Reactions in H. Inter punctata, When Disturbed Four Times Each Day 



Specimen I 



Date 



Indications of fear 

 only when speci- 

 men was slightly 

 disturbed with 

 dissecting needle 



Manifest signs of 

 agitation when 

 hand was passed 

 back and forth 

 above the dish 



Signs of fear dis- 

 played in the 

 way of swimm- 

 ing about in an 

 excited manner 

 when I appeared 

 before the en- 

 closure 



March 20 



21 



22 



23 



24 



25 



26 



27 



28 



29 



30 



31 



April 1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



A 



I) 



A 



I) 



B C 



C D 

 D 

 B D 



A C 



A 



D 

 B C 



1) 



I) 



B C 

 B D 



B C 

 C D 

 C D 

 BCD 

 B C 



