SECTION VI.
OF TRUTH OF VEGETATION.—CONCLUSION.
CHAPTER I.
OF TRUTH OF VEGETATION.
We have now arrived at the consideration of what was, with the old masters, the subject of most serious and perpetual study. If they do not give us truth here, they cannot have the faculty [§ 1. Frequent occurrence of foliage in the works of the old masters.]of truth in them; for foliage is the chief component part of all their pictures, and is finished by them with a care and labor which, if bestowed without attaining truth, must prove either their total bluntness of perception, or total powerlessness of hand. With the Italian school I can scarcely recollect a single instance in which foliage does not form the greater part of the picture; in fact, they are rather painters of tree-portrait than landscape painters; for rocks, and sky, and architecture are usually mere accessories and backgrounds to the dark masses of laborious foliage, of which the composition principally consists. Yet we shall be less detained by the examination of foliage than by our former subjects; since where specific form is organized and complete, and the occurrence of the object universal, it is easy, without requiring any laborious attention in the reader, to demonstrate to him quite as much of the truth or falsehood of various representations of it, as may serve to determine the character and rank of the painter.
It will be best to begin as nature does, with the stems and branches, and then to put the leaves on. And in speaking of trees generally, be it observed, when I say all trees, I mean only those ordinary forest or copse trees of Europe, which are the chief subjects of the landscape painter. I do not mean to include every kind of foliage which by any accident can find its way into a picture, but the ordinary trees of Europe,—oak, elm, ash, hazel, willow, birch, beech, poplar, chestnut, pine, mulberry, olive, ilex, carubbe, and such others. I do not purpose to examine the characteristics of each tree; it will be enough [§ 2. Laws common to all forest trees. Their branches do not taper, but only divide.]to observe the laws common to all. First, then, neither the stems nor the boughs of any of the above trees taper, except where they fork. Wherever a stem sends off a branch, or a branch a lesser bough, or a lesser bough a bud, the stem or the branch is, on the instant, less in diameter by the exact quantity of the branch or the bough they have sent off, and they remain of the same diameter; or if there be any change, rather increase than diminish until they send off another branch or bough. This law is imperative and without exception; no bough, nor stem, nor twig, ever tapering or becoming narrower towards its extremity by a hairbreadth, save where it parts with some portion of its substance at a fork or bud, so that if all the twigs and sprays at the top and sides of the tree, which are, and have been, could be united without loss of space, they would form a round log of the diameter of the trunk from which they spring.
But as the trunks of most trees send off twigs and sprays of light under foliage, of which every individual fibre takes precisely its own thickness of wood from the parent stem, and as [§ 3. Appearance of tapering caused by frequent buds.]many of these drop off, leaving nothing but a small excrescence to record their existence, there is frequently a slight and delicate appearance of tapering bestowed on the trunk itself; while the same operation takes place much more extensively in the branches, it being natural to almost all trees to send out from their young limbs more wood than they can support, which, as the stem increases, gets contracted at the point of insertion, so as to check the flow of the sap, and then dies and drops off, leaving all along the bough, first on one side, then on another, a series of small excrescences, sufficient to account for a degree of tapering, which is yet so very slight, that if we select a portion of a branch with no real fork or living bough to divide it or diminish it, the tapering is scarcely to be detected by the eye; and if we select a portion without such evidences of past ramification, there will be found none whatsoever.