PARKER AND STARRATT. — COLOR IN ANOLIS CAROLINENSIS. 461 



we might have expected the animals to have remained brown, it fol- 

 lows that at these temperatures heat was again a controlling stimulus 

 preponderating over light. 



Since at 40° and 45° the animals were persistently green, or at least 

 greenish, it was impossible by the method we adopted for using the 

 constant- temperature box to get records of rates comparable with those 

 for the temperatures 20° to 35°, As a means of ascertaining roughly 

 what the rate was at high temperatures four animals were put in a 

 muslin-covered cage, and after they had become thoroughly brown in 

 the light, the cage and they were quickly transferred to the dark, 



TABLE IL 



Rate of Change op Anolis from Green to Brown 

 AT Different Temperatures. 



constant-temperature box at 54°. In six minutes two of the lizards 

 were green and two yellowish-green. In a second trial with the box at 

 58° the change to green was accomplished in a little over four minutes. 

 In both these trials the necessity of opening the box to the outer air and 

 the conditions under which the lizards were exposed to the heat inside 

 made it impossible to state exactly what the temperature was that 

 induced the change. It must, however, be evident that at these higher 

 temperatures the rate is more rapid than at those recorded in Table I, 

 and this is what was to be expected. 



