the reader's pursuit, because I have long believed, and the whole second volume of "Modern Painters" was written to prove, that in whatever has been made by the Deity externally delightful to the human sense of beauty, there is some type of God's nature or of God's laws; nor are any of His laws, in one sense, greater than the appointment that the most lovely and perfect unity shall be obtained by the taking of one nature into another. I trespass upon too high ground; and yet I cannot fully show the reader the extent of this law, but by leading him thus far. And it is just because it is so vast and so awful a law, that it has rule over the smallest things; and there is not a vein of color on the lightest leaf which the spring winds are at this moment unfolding in the fields around us, but it is an illustration of an ordainment to which the earth and its creatures owe their continuance, and their Redemption. § XXVII. It is perfectly inconceivable, until it has been made a subject of special inquiry, how perpetually Nature employs this principle in the distribution of her light and shade; how by the most extraordinary adaptations, apparently accidental, but always in exactly the right place, she contrives to bring darkness into light, and light into darkness; and that so sharply and decisively, that at the very instant when one object changes from light to dark, the thing relieved upon it will change from dark to light, and yet so subtly that the eye will not detect the transition till it looks for it. The secret of a great part of the grandeur in all the noblest compositions is the doing of this delicately in _degree_, and broadly in _mass_; in color it may be done much more decisively than in light and shade, and, according to the simplicity of the work, with greater frankness of confession, until, in purely decorative art, as in the illumination, glass-painting, and heraldry of the great periods, we find it reduced to segmental accuracy. Its greatest masters, in high art, are Tintoret, Veronese, and Turner. § XXVIII. Together with this great principle of quartering is introduced another, also of very high value as far as regards the delight of the eye, though not of so profound meaning. As soon as color began to be used in broad and opposed fields, it was perceived that the mass of it destroyed its brilliancy, and it was _tempered_ by chequering it with some other color or colors in smaller quantities, mingled with minute portions of pure white. The two moral principles of which this is the type, are those of Temperance and Purity; the one requiring the fulness of the color to be subdued, and the other that it shall be subdued without losing either its own purity or that of the colors with which it is associated.