A STUDY OF COLOR VISION IN THE RING-DOVE 



31 



trials from the writer's note-book. The first portion of the 

 table gives the results of an early series of ten choices, those 

 of March 4th. The remainder of the table presents, by con- 

 trast, the results of a later series of fifteen trials in which the 

 birds were practically perfect in their discrimination. This series 

 was given on April 19th. The table indicates, in the first col- 

 umn, the position of the positive stimulus, that is the stimulus 

 indicative of the chamber to be entered. In the second column, 

 the letters R and W designate, respectively, correct and incor- 

 rect choices. 



TABLE 1 



Examples of Detailed Daily Records 



March 4, 1914, 10:10 A. M. With general illumination. Stimulus-lamp 86 cm* 

 from stimulus area. Coil at 1 cm. for female and 2 cm. for male. 



April 19, 1914, 9:50 A. M. With general illumination. Stimulus-lamp 126 cm. 

 from stimulus area. Coil at 2 cm. for both. 



