62 CHARLES W. HARGITT 



with similar results. However, when tried the following day 

 the creature failed utterly to respond to these tests. On a still 

 later day I transferred it to a jar into which had been placed a 

 leafy branch and scattered green leaves. In apparent response 

 the specimen gradually assumed a green color which spread 

 over the entire dorsal portion of body and legs, and was most 

 striking. A few hours later the leaves and branch were all 

 removed, but the green color persisted. Repeated experiments 

 of subjecting the specimen to darkness, placing it in open sun- 

 light, change of temperature, etc., were of no avail; the color 

 persisted for more than two weeks without essential variation, 

 save in the matter of intensity. Finally, it was released in a 

 tree in the garden lot and seemed perfectly at home, leaping 

 to catch flies, ants, etc., but still no color change appeared. 



A similar case appeared in the following fall. Three specimens 

 were taken, one being green, one quite dark, the third very 

 light. All were placed in an experimental cage and the follow- 

 ing day a second had changed to beautiful green. The third day 

 all were green, and so continued for five days. In the mean- 

 time another specimen had also been taken and was placed in 

 a separate cage. When taken it was distinctly greenish, though 

 not deeply so. During the process of transfer from field to 

 laboratory it had become very dark, and continued so for an 

 entire day. It then assumed a greenish hue which persisted 

 for several hours, but later was replaced by the dark color. 

 In neither of these had there been any proximity to leaves, 

 or any green body. Details on this point will be submitted in 

 a later connection. 



Temperature. The intimate relations of temperature and 

 light reactions have long been known; but only within recent 

 times has this been made a critical study. Parker and Starratt 

 ('04), and later Parker ('06), have shown rather conclusively 

 the importance of both, but especially that of temperature in 

 such behavior. One of the interesting conclusions of these 

 observers is that light and higher temperature act in directly 

 opposite ways, viz., that while light causes a distal migration 

 of pigment and darkness a proximal one, heat on the other 

 hand causes a proximal movement of pigment, and cold a distal 

 one. It follows, on this assumption, that where these factors 

 cooperate, i.e., light and low temperature, darkness and high 



