502 Journal of Comparative Neurology and Psychology. 



served as those which Fere' noticed in human breathing. 



The easy control of conditions made vision an excellent 

 field in which to experiment. Hence it was decided to inves- 

 tigate light reactions in some detail. As it is highly important, 

 for purposes of comparison, to study different orders of reac- 

 tion to given stimuli, I also made a short investigation of the 

 animal's color-preference. This study will be reported in the 

 next section, and the study of respiratory reactions to light in 

 the section next following. 



IV. Color-Preference Tests. 



As an index to the pigeon's color-preference, records were 

 kept of the position assumed by the animal when placed in a 

 wire covered, wooden box, half of which was illuminated, from 

 the side, by light of one color, and half by light of a different 

 color but of the same intensity. Use was made of incandescent 

 lamps and colored glasses as in the case of the respiratory reac- 

 tions, except that the continuous illumination made necessary 

 a water screen to cut off the heat rays. After nine records, 

 half an hour apart, were taken, the glasses were interchanged 

 and the bird's position relatively to the two colors was observ- 

 ed as before. This was repeated with other colors until each 

 of the four colors had been used with each of the other three. 



Akhough the animal's general behavior with regard to the 



light, especially when going into the box after the colors had 



been changed, was sometimes very significant, the principal ba- 



TABLE I. 

 COLOR PREFERENCE. 



'Fere Ch., Note sur les conditions physiologiques des emotions, Revite 

 Philosophique, 24, 566-8. 1887. 



