18 



while the other softened down proportionally into the 

 lighter tint ; and when the light was equalised, the two 

 sides were of similar complexion. Air, 72 ; temper- 

 ature of skin, 73 on lighter side, and 73 .25 on the 

 dark green side ; yellow field of colour, 73 .5 F. In 

 another experiment, the yellow was 74 .5 F. While 

 moving on the floor it became very opaque, the 

 darker spotted bands exhibited a temperature of 

 75 .25 ; and it is worthy of remark, that where the 

 ball of the thermometer rested, though the pressure 

 was gentle in the extreme, the spot became white. 

 21st July, at 30 minutes past 10, A. M. ; air, 69 .5 F. ; 

 neck of the chameleon, 70 .5 ; dark-coloured band, 

 71. 5; lighter parts, 71. In sunshine, the bands, 

 zebra-like, became remarkably distinct, and the darker 

 shades indicated 74, while the intermediate green 

 grounds oscillated between 72 .75 and 73 .5 F. 

 We do not believe that the coloured ground, traversed 

 in any way, affects the evolved tint, excepting so far 

 as the light reflected and modified from various coloured 

 surfaces, may operate differently on the circulation of 

 the blood ; since we presume that the change of colour 

 is in accord with the circulation of the blood as affected 

 by the action of light on the vital fluid through its 

 membranous envelope. As the circulation is languid, 

 or more active, in its flux through the system, a cor- 

 responding colour will be developed, to announce this 

 new phenomenon of chemical change, superinduced 

 by the stimulus of light on the blood, and this tint will 

 be a faithful index of its amount. The colour, too, 

 we have concluded, is the medium by which the 

 temperature of the system is equalised. Hence, too, 

 the negro tint may subserve an equally important end 

 in the system. 



Dr. Wilson Philip has proved that nervous influ- 



