HABITS AND REACTIONS OF LACRYMARIA 243 



8. The head in its jerky, rapid, random movements tests 

 every object within reach and rejects all those which can not 

 serve as food. It does not swallow^ inorganic substances, carmine 

 or ink particles and the like. This protozoan unquestionably 

 exercises selection in feeding. The mechanics involved in the 

 process of selection are, however, not known. 



9. During conjugation the reactions of the two united indi- 

 viduals are not coordinated. Each responds to stimuli inde- 

 pendently. 



LITERATURE 



Jennings, H. S. Behavior of the Lower Organisms. New York. 366 pp. 



1906. 

 LoEB, J.\QUES. The Dynamics of Living Matter. New York. 233 pp. 



1906. 

 M.\ST, S. O. Light and the Behavior of Organisms. Xew York. 410 pp. 



1911. 

 Mast, S. O. The Reactions of Didinium Nasutum (Stein), with Special Reference 



1909. to the Feeding Habits and the Function of Trichocysts. Biol. Bull, 

 Vol. 16, pp. 91-118. 



ScHAEFFER, AsA. Selection of Food in Stentor Caeruleus. Journ. E.rp. Zool., Vol. 



1910. 8, pp. 839-896. 



Verworn, M. Psycho-physiologische Protisten Studien. Joia: Fischer. 218 pp. 

 1889. 



