more complete insight into the nature of the physiological colours.
I
EFFECTS OF LIGHT AND DARKNESS ON THE EYE.
5.
The retina, after being acted upon by light or darkness, is found to be in two different states, which are entirely opposed to each other.
6.
If we keep the eyes open in a totally dark place, a certain sense of privation is experienced. The organ is abandoned to itself; it retires into itself. That stimulating and grateful contact is wanting by means of which it is connected with the external world, and becomes part of a whole.
7.
If we look on a white, strongly illumined surface, the eye is dazzled, and for a time is incapable of distinguishing objects moderately lighted.
8.
The whole of the retina is acted on in each of these