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242. LOEB, J., 1897. Zur Theorie der physiologischen Licht- und 



Schwerkraftwirkungen. Ibid., Bd. 66, S. 439. 



243. 1900. Comparative physiology of the brain and 



comparative psychology. New York. 



244. 1904. The control of heliotropic reactions in fresh 



water crustaceans by chemicals. Univ. of Cal. Pub., 

 vol. 2, p. 1. 



245. 1906. Ueber die Erregung von positivem Helio- 



tropismus durch Saure, insbesondere Kohlensaure, und 

 von negativem Heliotropismus durch ultraviolette Strah- 

 len. Pfliigers Arch., Bd. 115, S. 564. 



246. 1906. Ueber die Summation heliotropischer und 



geotropischer Wirkungen bei den auf der Drehschiebe 

 ausgeloster compensatorische Kopfbewegungen. Ibid., 

 Bd. 116, S. 368. 



247. 1907. Concerning the theory of tropisms. Jour. 



Exp. Zool., vol. 4, p. 151. 



248. LUBBOCK, J., 1883. Ants, bees, and wasps. New York. 



249. 1883. On the sense of colour among some of the 



lower animals, I. Jour. Linn. Soc., London, Zool., 

 vol. 16, p. 121. 



250. 1884. On the sense of colour, etc., II. Ibid., vol. 17, 



p. 205. 



251. 1888. On the senses, instincts, and intelligence of 



animals, with special reference to insects. New York. 



252. LUKA.S, F., 1905. Psychologic der niedersten Thiere. Wien 



und Leipzig. 



253. LYON, E. P., 1898. The functions of the otocyst. Jour. 



Comp. Neur. and Psych., vol. 8, p. 238. 



254. 1904. On rheotropism, I. Rheotropisrn in fishes. 



Am. Jour. Physiol., vol. 12, p. 149. 



255. 1905. On the theory of geotropism in Paramecium. 



Ibid., vol. 14, p. 421. 



256. 1906. Note on the geotropism of Arbacia larvae. 



Biol. Bull., vol. 12, p. 21. 



257. 1906. Note on the heliotropism of Palsemonetes larvae. 



Ibid., vol. 12, p. 23. 



258. McCooK, H. C., 1889-1893. American spiders and their 



spinning work. 3 vols. 



