LITEBATURE 179 



98 COEHN, A., and BARRATT, W. : Ueber Galvanotaxis vom Standpunkte 



der physikalischen Chemie. Z. allg. Physiol., 1905, v, 1-9. 



99 COHN, F. : Ueber die Gesetze derBewegung mikroskopischer Tiere und 



Pflanzen unter Einfluss des Lichtes. Jahr.-ber. Schles. Ges. vaterl. 

 Kultur, 1864, xlii, 35-36. 



100 COLE, L. J. : The Influence of Direction vs. Intensity of Light in De- 



termining the Phototropic Responses of Organisms. Science, 1907, 

 xxv, 784. 



101 CONGDON, E. D. : Recent Studies Upon the Locomotor Responses of 



Animals to White Light. /. Comp. Neurol. and Psychol., 1908, 

 xviii, 309-328. 



102 CORNETZ, V. : Ueber den Gebrauch des Ausdruckes " tropisch " und 



liber den Charakter der Richtungskraft bei Ameisen. Arch. ges. 



Physiol, 1912, cxlvii, 215-233. 

 i 3 COWLES, R. P. : Stimuli Produced by Light and by Contact with Solid 



Walls as Factors in the Behavior of Ophiuroids. /. Exp. Zool., 



1910, ix, 387-416. 

 i 4 COWLES, R. P. : Reaction to Light and Other Points in the Behavior of 



the Starfish. Papers from Tortugas Lab. Carnegie Inst. Wash- 

 ington, 1911, iii, 95-110. 

 K>5 COWLES, R. P. : The Influence of White and Black Walls on the 



Direction of Locomotion of the Starfish. J. Animal Behav., 1914, 



iv, 380-382. 

 1050 CRAIG, W. : The Voices of Pigeons Regarded as a Means of Social 



Control. Am. J. Sociology, 1908, xiv, 86-100. 

 1056 CRAIG, W. : Male Doves Reared in Isolation. J. Animal Behav., 1914, 



iv, 121-133. 

 105c CRAIG, W. : Appetites and Aversions as Constituents of Instincts. 



Biol. Bull., 1918, xxxiv, 97-107. 



106 CROZIEJI, W. J. : The Orientation of a Holothurian by Light. Am. 



J. Physiol, 1914, xxxvi, 8-20. 



107 CROZIER, W. J. : The Behavior of Holothurians in Balanced Illumina- 



tion. Am. J. Physiol., 1917, xliii, 510-513. 



108 CROZIER, W. J. : The Photoreceptors of Amphioxus. Anat. Eec., 1917, 



xi, 520. 



1080 CROZIER, W. J.: The Photic Sensitivity of Balanoglossus. J. Exp. 

 Zool., 1917, xxiv, 211-217. 



109 CZAPEK, F. : Ueber Zusammenwirken von Heliotropismus und Geo- 



tropismus. Sitzngsb. Akad. Wiss. Wien. mathem.-naturw. KL, 1895, 

 civ. 



110 CZAPEK, F. : Untersuchungen iiber Geotropismus. Jahrb. wiss. Bot., 



1895, xxvii, 243-339. 



