RESPONSES TO MONOCHROMATIC LIGHT 



11 



TABLE IV 



Showing Effect on Habit of Leaving Positive Color at Full Intensity 

 and Gradually Introducing Color Reacted Against 



Rat I 



(Reacting positively to blue) 



Rat II 



(Reacting positively to yellow) 



Perfect discrimination at full intensity. 



(1) Only one stimulus used for that day. 

 (*) Equal energy. 



Animal died. Was discriminating 

 fairly well at equal energy. Death 

 was due to cancerous growth upon 

 neck; during the past month growth 

 had increased enormously in size. 

 Animal worked faithfully until the 

 day before his death. 



