144 E. MELVILLE DuPORTE 



Another question which suggested itself was whether the 

 insect would recover, its sensitiveness if allowed to rest. It 

 was found that after one or two hours' rest the reaction was 

 in general similar to that obtained by changing the method of 

 producing the shock, except that there was a larger number of 

 fairly long successions. 



The history of the three following cases will serve to illus- 

 trate more definitely some of the points discussed in this 

 section : 



Dl. Left for an hour after the fourteenth feint. On resuming 

 the experiment, the first four trials were successful; of 

 the six next, three were successful and after this there 

 was a long series of failures with an occasional success. 

 The method of inducing the feint was then changed 

 and the insect dropped on its back instead of being 

 merely turned over. In the first eight attempts there 

 were five successes but after this, repeated endeavor 

 could elicit no response. 



El: The feint was produced immediately by the first seven 

 attempts. The fifteen following elicited the feint eight 

 times, and after that the insect feigned death only 

 twice in twenty trials. The method of producing the 

 shock was changed and the insect feigned three times 

 in the first ten trials. 



I. In the first forty-five trials there were thirty-three suc- 

 cesses and after this a long succession of failures. The 

 insect was left for an hour and the trials were then 

 resumed. The first three attempts were successful, 

 but after these twenty successive attempts elicited no 

 response. A change in the method of stimulating the 

 feint resulted in the production of several partial feints 

 but few T perfect responses. 



During the feint the muscles of the legs are very tensely 

 contracted and Gee and Lathrop suggest that muscular fatigue 

 eventually occurs as a result of this contraction, thus explain- 

 ing in part the failure to elicit indefinite response. 



Effect of Mutilation on the Death Feint. Several specimens 

 were placed in the death feint and while in this condition por- 



