AND ITS BIOLOGICAL SIGNIFICANCE. 337 



from this point of view; they are adaptations to the movements and behavior of 

 the organisms. 



In these unsymmetrical organisms moving in spirals, the method of reaction 

 to most stimuli is closely correlated with the unsymmetrical form. 



V. BIBLIOGRAPHY. 



BUtschli, O. 



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'97-: 02. Studies on Reactions to Stimuli in Unicellular Organisms: 1, Jour, of Physiol., vol. 21, nos. 4-5; 

 pp. 258-322; 2, Amer. Jour. Physiol., vol. 2, no. 4, pp. 311-341; 3, Amer. Nat., vol. 33, no. 389, 

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: 01. On the Significance of the Spiral Swimming of Organisms. Amer. Nat., vol. 35, no. 413, pp. 369-378. 



