256 THE BEHAVIOR OF LOWER ORGANISMS. 



SOSNOWSKI, J. 



1899. Untersuchungen iiber die Veranderungen der Geotropismus bei Para- 



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 STAHL, E. 



1884. Zur Biologic der Myxomyceten. Bot. Zeitung, Jhrg. 40, pp. 146-155 ; 



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 STRASBURGER, E. 



1878. Wirkung des Lichtes und der Warme auf Schwarmsporen. Jenaische 



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(The citations are to pages of the separate reprint.) 

 THORNDIKE, E. L. 



1898. Animal intelligence. An experimental study of the associative pro- 



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 TOWLE, ELIZ. W. 



1900. A study in the heliotropism of Cypridopsis. Amer. Journ. Physiol., 



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 UEXKULL, J. v. 



1899. Die Physiologic der Pedicellarien. Zeitschr. f. Biol., Bd. 37, pp. 334- 



43- 



1900. Die Physiologic des Seeigelstachels. Ibid., Bd. 39, pp. 73-112. 



1900 . Die Wirkung von Licht und Schatten auf die Seeigel. Ibid., Bd. 40, 



pp. 447-476. 

 1903. Studien iiber den Tonus. I. Der biologische Bauplan von Sipunculus 



nudus. Ibid., Bd. 44, pp. 269-344. 

 VERWORN, M. 



1889. Psycho-physiologische Protistenstudien. Experimentelle Untersuch- 



ungen. 219 pp., 6 pi. Jena. 



1890. Biologische Protistenstudien, II. Zeitschr. f. Wiss. Zool., Bd. 50, pp. 



443-468, pi. 18. 



1890 a. Die polare Erregung der Protisten durch den galvanischen Strom. 

 Arch. f. d. ges. Physiol., Bd 46, pp. 281-303. 



1891. Die physiologische Bedeutung des Zellkernes. Arch. f. d. ges. Physiol., 



Bd. 51, pp. 1-118, pis. 1-6. 



1892. Die Bewegung der lebendigen Substanz. 103 pp. Jena. 



1895. Allgemeine Physiologic. Ein Grundriss der Lehre vom Leben. 584 



pp. Jena. 

 1897. Die polare Erregung der Protisten durch den galvanischen Strom. IV. 



Mittheilung. Arch. f. d. ges. Physiol., Bd. 65, pp. 47-62. 



1899. General Physiology. An Outline of the Science of Life. Transl. by 



F. S. Lee. , New York. 615 pp. 

 WAGER, H. 



1900. On the eye-spot and flagellum of Euglena viridis. Journ. Lin. Soc. 



London, Zool., Vol. 27, pp. 463-481. 

 WALLENGREN, HANS. 



1902. Zur Kenntnis der Galvanotaxis. Zeitschr. f. allg. Physiol., Bd. 2, pp. 



34I-384- 



1903. Zur Kenntnis der Galvanotaxis. II. Eine Analyse der Galvanotaxis 

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W^ LLICH, G. C. 



1663 a. Further observations on an undescribed indigenous Amoeba, with 

 notes on remarkable forms of Actinophrys and Difflugia. Ann. and 

 Mag. of Nat. Hist. (3), Vol. n, pp. 365-371, pi. 9. 



1863 b. Further observations on the distinctive characters and reproductive 

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 (3), Vol. 12, pp. 329-337. 



1863 c. Further observations on the distinctive characters, habits, and repro- 

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 YERKES, R. M. 



1900. Reactions of Entomostraca to stimulation by light. II. Reactions of 

 Daphnia and Cypris. Amer. Journ. Physiol., Vol. 4, pp. 405-422. 



