28 'Journal of Comparative Neurology and Psychology. 



TABLE VI. 



B's Reactions to Blue-Yellov 



A — With Stimulus Constant. 



B — With Stimulus Variable. 



8-10 

 8-12 

 8-13 



8-15 

 8-15 



-16 

 -16 



-16 

 -16 



-17 

 -17 



-17 

 -18 

 -18 

 -19 

 -20 



100 



94 

 100 

 100 



100 

 81 



94 

 100 



100 

 100 

 100 

 100 



100 

 100 

 100 

 100 

 100 



By mistake on this day the episcotister, 

 set in the tests on the other animals 

 usually with a 30° opening, was 

 clo-sed to 10°. The animal dashed to 

 the yellow on his first two trials, then 

 became steady and made only one 

 more error in the series. Filmy clouds 

 were passing over the sun and at 

 times the blue was barely over my 

 own threshold. 



Changes in intensity made in midst of 

 series. 



Changes in intensity made in midst of 

 series. 



Half vertical strip of yellow shown. 

 Half vertical strip of blue shown. 



Surface value altered by pasting tissue 

 paper over surface of ground glass. 



