302 C. H. TURNER. 



was no obvious relation between temperature and the duration 

 of the feints. 



Effects of the Strength of Stimulus upon Letisimulation. To get 

 the stimulus as nearly uniform as possible, the ant-lion was 

 gently shoved from a glass ledge and caused to fall three inches. 

 To secure a strong stimulus the ant-lion was permitted to fall 

 upon a glass plate; to secure a weak one it was allowed to drop 

 on a layer of cotton batting. The results of experimenting with 

 100 ant-lions was tabulated. In 36 cases the first letisimulation 

 following a strong stimulus was the longer and in 58 cases the 

 first feint following a weak stimulus was the longer. In six 

 cases the duration of the feint was the same for each stimulus. 

 The average of 100 individuals gave the duration of the first 

 letisimulation following a weak stimulus as of longer duration 

 than the first following a strong stimulus. These data do not 

 seem to warrant a conclusion. 



Effects of Hunger upon Letisimulation. Certain selected in- 

 dividuals were well fed and others were forced to fast for a long 

 time before they were used for experiments identical with those 

 mentioned above. The results were carefully tabulated. No 

 relation could be detected between hunger and the length of the 

 letisimulation. 



Apparently the reason for the longest letisimulation being 

 located sometimes at one place and sometimes at another in the 

 series is due to some internal (physiological) factor not revealed 

 by these experiments. 



Weir 1 considers the letisimulation of animals "one of the 

 greatest evidences of intellectual action, on their part." Hamilton 

 (29), Webster (39) and a few others feel that the creatures con- 

 sciously fear death and take this means to avoid it. Dr. Lindsley, 

 in "Mind in Animals," thinks "this must require great command 

 in those that practice it." However, the majority of modern 

 students of the subject look upon it as merely a remarkable 

 instinct. 



No one who is acquainted with how slowly the ant-lion recovers 

 from injuries could, for a moment, consider anything intellectual, 

 which induces it to passively submit to portions of its legs and of 



1 Weir, "Dawn of Reason," 1889, p. 202. 



