ACQUIRED SPECIFIC REACTIONS TO COLOR 



163 



(September 2, 3, 4 and 5) no reaction was obtained. Counting 

 each reaction for each animal as an observation, the total num- 

 ber of observations under these conditions was 198. The dis- 

 tribution of the reactions with respect to each light and to 

 each crab is given in Table II. The letters L and R indicates 

 whether the light occupied the left or right window of the 



reaction box. 



TABLE II 



It will be seen from the table that the white light received 

 most of the reactions, with green next, then blue and yellow 

 about equal, and finally red least of all. The table also shows 

 in which window (right or left) the light was exposed when 

 it was reacted to positively. It will be seen that with red, 

 yellow, and white the reactions were divided about equally 

 between the right and left windows. With green there is an 

 excess of 6 in favor of the left window; while with blue there 

 is an excess of 5 in favor of the right window. The author 

 considers these deviations from the distribution according to 

 chance, to be non-significant, although he is unable to account 

 for them. Figure 3 shows by means of a graph the distribu- 

 tion of the reactions with respect to lights, which are exhibited 

 in Table II. 



The reaction times of the ten crabs which were used in this 

 set of observations have been determined and grouped. The 

 time measured was the time in seconds which elapsed between 

 the emergence of the animal ffom the V-shaped pen and the 



