Hadley, Behavior of the American Lobster. 



221 



Case 2 — ^When the order of the glass plates was changed to red, 

 blue, orange, green, the following results were obtained: Red, 

 3; blue, 31; orange, 3; green, 3. 



Case 3 — After redistribution of the larvae had taken place, the 

 small window opening at the green end of the box was uncovered 

 to the diffuse light of the room. The resulting reactions were as 

 follows : 



Case ^ — Once more the order of the glass plates was changed to 

 blue, green, orange, red, and the window at the red end was uncov- 

 ered to the light of the room. The results of the three sets of tests 

 were: Blue, 9; green, 5; orange, 3; red, 13. 



Experiment i^ — The following observations deal with cases of 

 larvae suddenly submitted to a light of great intensity, as for instance 

 when they are brought from subdued daylight into full sunlight, 

 or when the brilliant rays from an acetylene lamp fall upon larvae 

 which had been for sometime in darkness. 



Case I — July 18, 4 p.m. Fifty first-stage larvae, about thirty 

 hours old, which had been reacting positively in lights of low or 

 medium intensity, were placed (in a glass jar) in the bright sunlight 

 of the west table. Every larva at once moved to the room side 

 of the jar. Within a few minutes, however, all returned to the 

 window side of the jar. Ten minutes later they were divided 



