Further favorable stimulation of the eye is given in the method of the Impressionists in treating "values," that is, comparative relations of light and shade. The real tones of objects including the sky, light, etc., can never be reproduced. The older schools, conscious of this, were satisfied to paint in a scale of correspondence, in which the relative values were fairly kept. But even by that means, the great differences of intensity could not be given, for the brightest spot of any painting is never more than sixty-six times brighter than the darkest, while the gray sky on a dull rainy day is four hundred and twenty times brighter than a white painted cross-bar of a window seen against the sky as background.<1> There were various ways of combating this difficulty. Rembrandt, for instance, as Kirschmann tells us, chose the sombre brown tone, "not out of caprice or an inclination for mystic dreaming (Fromentin), but because the yellow and orange side of the color-manifold admits of the greatest number of intervals between full saturation and the darkest shade." The precursors of the Impressionists, on the other hand, succeeded in painting absolute values, confining themselves to a very limited gamut; for this reason the first landscapes of the school were all gray-green, dull, cloudy. But Monet did not stop there. He painted the ABSOLUTE VALUES of objects IN SHADE on a sunny day, which of course demands the brightest possibilities of the palette, and got the lighted objects themselves as nearly as he could,--thus destroying the relative values, but getting an extraordinary joyous and glowing effect; and one, too, of unexpected verisimilitude, for it would seem that in a sunlit scene we are really attentive to the shaded objects alone, and what becomes of the others does not so much matter. This effect was made still more possible by the so-called dissociation of colors,--i.e. the juxtaposing of tints, the blending of which by the eye gives the desired color, without the loss of brightness which a mixing of pigments would involve. Thus by putting touches of black and white side by side, for instance, a gray results much brighter than could have been otherwise reached by mixing; or blue and red spots are blended by the eye to an extraordinarily vivid purple. Thus, by these methods, using the truth of color in the sense of following the nature of retinal functioning, Monet and his followers raised the color scale many degrees in brightness. Now we have seen that the eye loves light, warmth, strong color-effects, related to each other in the way that the eye must see them. Impressionism, as the name of the method just described, makes it more possible than it had been before to meet the demands of the eye for light and color, to recover "the innocence of the eye," in Ruskin's phrase. Truth to the local color of objects is relatively indifferent, unless that color is beautiful in itself; truth to the reciprocal relations and