with narrow blue and yellow stripes appears green at a certain distance.
824.
If, again, the eye sees blue and yellow next each other, it finds itself in a peculiar disposition to produce green without accomplishing it, while it neither experiences a satisfactory sensation in contemplating the detached colours, nor an impression of completeness in the two.
825.
Thus it will be seen that it was not without reason we called these combinations characteristic; the more so, since the character of each combination must have a relation to that of the single colours of which it consists.
COMBINATIONS NON-CHARACTERISTIC.
826.
We now turn our attention to the last kind of combinations. These are easily found in the circle; they are indicated by shorter chords, for in this case we do