108 



CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



I I unobstructed, ■ill partially obscured, I^Bi obscured, ® dilatation 

 of zanthophore, O contraction of zanthophore, O maximum distal migration 

 of pigment, ® partial distal migration of pigment, ® maximum proximal migra- 

 tion of pigment. No. 1-5 indicate comparative degrees of either obscuration 



or migration. 



For the final solution of this problem of the color changes in 

 Anolis, three methods of attack m.ust be carried on and one must 

 not lose sight of any one of them: Carefully controlled physio- 

 logical experiments, histological studies of the skin, and careful 



