The Flounder 255 
moves from the dark to the light the eye conveys the impression to 
the brain, which in turn sends it on to the cells all over the back, and 
.—The Flounder. 

these open or close to make the back the same colour as the ground on 
which the fish is resting. This changing of colour continues for a time 
after the fish is dead, and may be seen by removing the fish from a 
