REACTIONS OF ARTHROPODS TO LIGHTS 



489 



The records of the responses when the flies were subjected to 

 the respective combinations of different colors are given in table 

 3. For convenience in comparing the relative potencies of the 

 colors, as expressed in per cents of reactions, table 4 is intro- 

 duced, in which each color is readily compared with every other 

 color and with darkness. 



In table 4 the colors heading the columns are compared with 

 those facing the lines. For example, if we wish to know what 

 percentage of the flies went to the green in the green-yellow pair 

 of lights we look for the number in the column headed green 

 and in the line opposite the yellow. The number 79 indicates 

 that in the experiment with this pair of lights 79 per cent of 

 the individuals tested went to the green away from the yellow. 



TABLE 3 

 Reactions of Calliphora adult to pairs of monochromatic lights of equal intensilij 



TABLE 4 

 Combined records of Calliphora adult reactions 



