But however interesting it might be to follow out these episodical instances, they would lead us too far from our original compass. We have plainly exhibited the identity of principle which governs the bases of sound and color, and might fairly write Q.E.D. to our proposition; but the fact so determined has a farther bearing upon art, which it may not be out of place to enlarge upon. The painter's palette, charged with color, is the instrument with which he thrills a melody to the eye, even as the magniloquent organ or the sigh-breathing flute speak to the ear. And just as the compass of all instruments is constructed on the diatonic scale, so should the range of the palette depend upon the tinges of the spectrum. While artists of a certain school pretend to imitate Nature, who paints literally with a pencil dipped in rainbow, they make use of a complication of tints, at which their goddess would shudder. In mixing and mixing on the groaning palette, they generate an unhappy brood of misformed tones, which never can agree upon the canvas; while the pigments, impure at best, become doubly so by amalgamation, the ramifications of contrast which such differences superinduce are sure to prove sometimes repulsive. Contrast is nature's charm, the bubbling source that she exhausts for her prettiest harmonies and varieties. But earthen pitchers are easily broken at the brink, and if the slippery streams thence flowing are not judiciously checked, they merge into a harsh flood that sweeps away all grace, like the magic fountain in the German myth, whose fairy tricklings, uncovered for a single night, burst into a curbless flood, that drowned the sleeping landscape ere the dawn. The small reactions of contrast in infinitesimal tints, are perhaps neglected or unforeseen, but their influence is fearfully apparent in the end. The simplicity of beauty is very limited, and he who dabbles in infinite decompositions of color will be certain to encounter turbid and unnatural tones, whose ultimate result will be an inharmonious and disunited whole. It is true that in the landscape, and cloudscape, and waterscape, there are wonderful extremes of chromatic gradation, for it is the hand and mind of nature that adorns herself; she can see unerringly, and lay on divinely, the remotest intricacies of shade, and her colors are pure light, swimming in ether.