THE BEHAVIOR OF AMCEBA 25 



factor in causing reaction, so that such acclimatization is a constant, 

 normal factor in the behavior. A change in reaction due to a different 

 cause is seen in Rhumbler's observation of the fact that Amoeba after 

 beginning to ingest food may reject it when subjected to light. 



Beyond facts of this character, little is known as to the modifiability 

 of reactions in Amoeba. 



LITERATURE I 



(Works are cited here by giving the author's name followed by the date of publi- 

 cation. The full title will be found in the alphabetical list at the end of the volume. 

 Only the important works are mentioned.) 



A. General account of the behavior of Amoeba, giving details of the observations 

 on which the foregoing account is mainly based : Jennings, 1904 e. 



B. Attempted physical explanations of the activities of Amoeba : Rhumbler, 

 1898; .Butschli, 1892; Bernstein, 1900; Jensen, 1901, 1902; Verworn, 1892; 

 Jennings, 1902 a, 1904 £-; Rhumbler, 1905. 



C. General works on Amoeba and its relatives : Butschli, 1880 ; Penard, 1902 ; 

 Leidy, 1879. 



D. Reactions to unlocalized stimuli, and to localized heat: Verworn, 1889. 



E. Reaction to electricity: Verworn, 1889 b, 1896 a; Jennings, 1904 £. 



F. Reactions to light: Davenport, 1897; Harrington and Leaming, 1900; 

 Engelmann, 1879. 



