ACQUIRED SPECIFIC REACTIONS TO COLOR 



157 



Color Analysis 

 Dominant Hue Per Cent White Total White Transm. 



The reaction box was attached to the wall of an aquarium 

 which floated in the Sound. This aquarium was about 160 

 cms. in length by 120 cms. in breadth by 60 cms. in depth. 

 The long dimension of the aquarium was approximately north- 

 east by southwest. The reaction box was attached by its long 

 side to the southeast wall of the aquarium with its two windows 

 facing the northeast. The box was submerged to a depth of 

 12.5 cms. Inasmuch as the experiments were made for the 

 most part in the morning at approximately the same time 

 (from 9 a. m. to 11 a. m.) a certain constancy of illumination 

 was secured. The specimens were collected from time to time 

 as they were needed. When not being used for reactions they 

 were placed in the aquarium above described. This aquarium 

 proved to be very suitable for marine plant and animal life as 

 very delicate deep-sea forms throve in it for weeks at a time. 

 The attempt was made to secure reactions to light from the 

 crabs when the box was out of the water. These attempts 

 proved unsuccessful. The reaction box was therefore -submerged 

 to the depth already mentioned which was sufficient to cover 

 the windows. In this way, the intensity of the light was cut 



