XII 



CIIAXCIES OF COLOUR 



/ 



the skin of a Cliameleoii. Highly 

 inagiiitied. C. deeper portion of the 

 cutis : C'h, tliree chroinatoijhores, in 

 various stages of contraction, filleil 

 with black, brown, or reddish pig- 

 ment ; E, epidermis ; 11', white layer 

 of gi-anules ; Y, yellow layer of cells. 



striated iridescent cells of tlie INIalpiyhiiiii layer. Those parts into 

 which the chromatophores do not .send pigment appear as yellow 

 spots. The chromatophores are to a great extent under control 

 of the will of the Chameleon, 

 liut external stimuli, as heat and 

 cold and other retlex actions, 

 also play a great part in their 

 movements. 



For further intormation on 

 this subject see Brllcke,^ P. Bert," 

 Pouchet,^ Thilenius,* and lastly 

 Keller/ who has written a very 

 long but rather confused account. 



The process of moulting is Fig. 1 50. —Diagrammatic section through 



curious. AVhen the Chameleon 

 is in good health the whole 

 process is accomplished within a 

 few hours. The skin to be cast 

 off becomes loose and assumes a 

 blistered appearance. Sometimes the creature looks as if it were 

 wrapped up in white, semi-transparent tissue paper. By rubbing 

 against stones, or between the twigs of trees, the skin comes off 

 in large flakes, first on the lips, then on the contorted body, and 

 last on the under surface of the hands and feet. During a rapid 

 and successful moult the changes of colour go on as usual in the 

 new skin. Sometimes large flakes of the old skin remain 

 adherent for days, especially on the top of tlie liead. The 

 moulting takes place several times in one year. One of my 

 Ch. vulgaris moulted in January and September, and then not 

 until June of the next following year. A Ch. j^Kmilns moulted 

 in the months of May, October, and ]\Iarch. 



When they know themselves ta be discovered. Chameleons 

 make themselves as thin as possible by compressing the body or 

 rather the belly. This is done by means of the peculiarly 

 elongated abdominal ribs described above. The whole body is 

 then put into such a position that, liy presenting only its 

 narrow edge to the enemy, it has become as little visible as 



1 Denk. Ak. Wicn. iv. 1852. - C. 11. Ass. Fratir. Ix.xx. 1876, No. 21. 



^ J. de I'anat. j)hysiol. viii. 1872, p. 401. 



■» Morijhol. Arbeit, vii. 1897, \>. 'oVo. ^ Arch. PhmioJ. Ixi. 1895, ]>. 123. 



