388 LIGHT AND THE BEHAVIOR OF ORGANISMS 



Nichols, E. L., 1905. On the Distribution of Energy in the Visible Spec- 

 trum. Phys. Rev., Vol. 21, pp. 147-165. 



NicOLAi, G. F, (and Dr. Baudouin), 1908. Das Lernen der Tiere (auf 

 Grund von Versuchen mit Pawlowscher Speichelfistel). Centr. f. 

 Physiol., Bd. 22, pp. 362-364. 



NoRDHAUSEN, M., 1907. Uber die Bedeutung der papillosen Epidermis als 

 Organ fur die Lichtperzeption des Laubblattes. Ber. d. deutsch. bot. 

 Ges., Vol. 25, pp. 398-410. 



NuEL, J. P., 1904. La vision. Paris, 376 pp. 



Oelzelt-Newin, a., 1906. Beobachtungen iiber das Leben der Protozoen. 

 Zeit. f. Psych, und Physiol, der Sinnesorgane, Bd. 41, pp. 349-382. 



Oltmanns, F., .1892. Uber die photometrischen Bewegungen der Pflanzen. 

 Flora, Vol. ..75, pp. 183-266. 



, 1897. Uber positiven und negativen Heliotropismus. Ibid., 



Vol. 83, pp. 1-32. _ ^ 



Orbeli, L. a., 1908. Conditioned Reflexes resulting from Optical Stimu- 

 lation of the Dog. Dissertation. St. Petersburg, 1908. (Russian.) 



OSTWALD, W., 1907. Zur Theorie der_ Richtungsbewegungen niederer 

 schwimmender Organismen, III. Uber die Abhangigkeit gewisser 

 heliotropischer Reaktionen von der inneren Reibung des Mediums, 

 sowie u. d. Wirkung " mechanischer Sensibilatoren." Arch. f. d. ges. 

 Physiol., Bd. 117, pp. 384-408. 



Parker, G. H., 1901. Reactions of Copepods to Various Stimuli and the 

 Bearing of this on Daily Depth Migrations. Bull. U. S. Fish Com. 

 for 1901, pp. 103-123. 



— ■ , 1903. The Phototropism of the Mourning-cloak Butterfly. Mark 



Anniversary Volume, pp. 453-469. 



, 1903a. The Skin and the Eyes as Receptive Organs in the Re- 

 actions of Frogs to Light. Amer. Jour. Physiol., Vol. 10, pp. 

 28-36. 



, 1905. On the Stimulation of the Integumentary Nerves of Fishes 



by Light. Ibid., Vol. 14, pp. 413-420. 



1908. The Sensory Reactions of Amphioxus. Proc. Amer. Acad. 



Arts and Sci., Vol. 43, pp. 415-455- 

 Parker, G. H., and Arkin, L., 1901. The Directive Influence of Light on 

 the Earthworm Allolobophora foetida (Sav.). Amer. Jour. Physiol., 



Vol. 4, pp. 151-157- 

 Parker, G. H., and Burnett, F. L., 1901. The Reactions of Plananans 



with and without Eyes to Light. Ibid., Vol. 4, pp. 373-385- 

 Patten, W., 1886. Eyes of Molluscs and Arthropods. Mit. a. d. Zool. 



Sta. z. Neapel, Bd. 6, pp. 542-756. 

 Payer, J., 1842. Memoire sur la tendance des tiges vers la lumiere. 



Compt. rend., t. 15, pp. 1194-1196. 

 Pearl, R. J., 1901. Studies on the Effects of Electricity on Organisms. 



11. The Reactions of Hydra to the Constant Current. Amer. Jour. 



Physiol., Vol. 5, pp. 301-320. 

 — , 1903. The Movements and Reactions of Fresh-water Plananans. 



Quar. Jour. Micr. Sci., Vol. 46, pp. 509-714. 



1904. On the Behavior and Reactions of Limulus in Early Stages 



of its Development. Jour. Comp. Neur. and Pysch., Vol. 14, pp. 138- 



164. 

 Pearl, R. J., and Cole, L. J., 1901. The Effect of Very Intense Light on 



Organisms. Report Mich. Acad. Sci., 1901, pp. 77-78- 

 Pearse, a. S., 1906. Reactions of Tubularia crocea. Amer. Nat., Vol. 40, 



pp. 401-407. 



