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552. Parker, G. H., and Arkin, L., 1901. The directive influ- 



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553. Parker, G. H., and Burnett, F. L., 1901. The reactions of 



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554. Parker, G. H., and Metcals?, C. R., 1906. The reactions 



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555. Parker, G. H., and Parshley, H. M., 1911. The reactions of 



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556. Parker, G. H., and Sheldon, R. E., 1912. The sense of smell 



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557. Patten, W., 1893. On the morphology of the brain and sense 



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558. Patten, B. M., 1914. A quantitative determination of the 



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559. 1915. An analysis of certain photic reactions with 



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560. 1916. The changes of the blowfly larva's photosensitivity 



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561. Pearl, R. J., 1903. The movements and reactions of fresh- 



water planarians. Ibid., vol. 46, p. 509. 



562. 1904. On the behavior and reactions of Limulus in 



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563. Pearl, R. J., and Cole, L. J., 1901. The effect of very intense 



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564. Pearse, A. S., 1906. Kea,ctions oi Tubularia crocea. Am. Nat., 



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565. 1908. Observations on the behavior of the holothurian 



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566. 1910. The reactions of amphibians to light. Proc. Am. 



Acad. Arts and Sciences, vol. 45, no. 6. 



567. 1911. The influence of different color environments on the 



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