48 A. M. REESE 



The cage being uncovered, the light was evenly distributed over 

 the bottom, but entered, as said, from one end. Under these 

 conditions, in 16 observations, at 5-minute intervals, 191 animals 

 were noted in the half of the cage towards the sun, to 120 animals 

 in the other half. After observations 8, 11, and 14 all the ani- 

 mals were gently pushed to the center of the cage, which dimin- 

 ished the preponderance of those in the half towards the sun. 

 This experiment seems to indicate that, where the light is suf- 

 ficiently bright, the animals tend to go towards it, as in the 

 laboratory experiments. 



These outdoor experiments, then, seem to substantiate, so far 

 as they go, the results of the laboratory experiments. 



