be most easily described by observing that they are to be found in the colorific circle, not by diameters, but by chords, in such a manner that an intermediate colour is passed over.
817.
We call these combinations characteristic because they have all a certain significancy and tend to excite a definite impression; an impression, however, which does not altogether satisfy, inasmuch as every characteristic quality of necessity presents itself only as a part of a whole, with which it has a relation, but into which it cannot be resolved.
818.
As we are acquainted with the impressions produced by the colours singly as well as in their harmonious relations, we may at once conclude that the character of the arbitrary combinations will be very different from each