In some trees the branches are symmetrically arranged, the pitch-tree and the fir, for example; while with others they are dispersed without any order or regularity, as in the robur, the apple, and the pear. In the fir the branches are thrown out from the trunk straight upwards, pointing to the sky, and not drooping downwards from the sides of the trunk. It is a singular thing,[2538] but this tree will die if the ends of its branches are cut, though, if taken off altogether, no bad effect is produced. If it is cut, too, below the place where the branches were, the part of the tree which is left will continue to live; but if, on the other hand, the top only of the tree is removed, the whole of it will die.
Some trees, again, throw out branches from the roots, the elm for example; while others are branchy at the top, the pine for instance, and the lotus[2539] or Grecian bean, the fruit of which, though wild, resembles the cherry very closely, and is called the lotus at Rome, on account of its sweetness. For sheltering houses these trees are more particularly esteemed, as they throw out their branches to a considerable distance, from a short trunk, thus affording a very extensive shade, and very frequently encroaching upon the neighbouring mansions. There is no tree, however, the shade afforded by which is less long-lived than this, and when it loses its leaves in winter, it affords no shelter from the sun. No tree has a more sightly bark, or one which has greater attractions for the eye; or branches which are longer, stouter, or more numerous; indeed, one might almost look upon them as forming so many trees. The bark[2540] of it is used for dyeing skins, and the root for colouring wool.
The branches of the apple-tree have a peculiar conformation; knots are formed which resemble the muzzles[2541] of wild beasts, several smaller ones being united to a larger.
CHAP. 54.—THE BRANCHES OF TREES.
Some of the branches are barren, and do not germinate; this takes place either from a natural deficiency of strength, or else some injury received in consequence of having been cut, and the cicatrix impeding the natural functions. The same that the branch is in the trees that spread out, is the eye[2542] in the vine, and the joint in the reed. All trees are naturally the thickest in the parts that are nearest the ground. The fir, the larch, the palm, the cypress, and the elm, and, indeed, every tree that has but a single trunk, develope themselves in their remarkable height. Among the branchy trees the cherry is sometimes[2543] found to yield a beam forty cubits in length by two in thickness throughout. Some trees divide into branches from the very ground, as in the apple-tree, for example.
CHAP. 55. (31.)—THE BARK OF TREES.
In some trees the bark[2544] is thin, as in the laurel and the lime; in others, again, it is thick, as in the robur; in some it is smooth, as in the apple and the fig, while in the robur and the palm it is rough: in all kinds it becomes more wrinkled when the tree is old. In some trees the bark bursts spontaneously, as in the vine for instance, while in others it falls off even, as we see in the apple and the arbutus. In the cork-tree and the poplar, the bark is substantial and fleshy; in the vine and the reed it is membraneous. In the cherry it is similar to the coats of the papyrus, while in the vine, the lime, and the fir, it is composed of numerous layers. In others, again, it is single, the fig and the reed for instance.
CHAP. 56.—THE ROOTS OF TREES.
There are great differences, too, in the roots of trees. In the fig, the robur, and the plane, they are numerous; in the apple they are short and thin, while in the fir and the larch they are single; and by this single root is the tree supported, although we find some small fibres thrown out from it laterally. They are thick and unequal in the laurel and the olive, in which last they are branchy also; while in the robur they are solid and fleshy.[2545] The robur, too, throws its roots downwards to a very considerable depth. Indeed, if we are to believe Virgil,[2546] the æsculus has a root that descends as deep into the earth as the height to which the trunk ascends in the air. The roots of the olive, the apple, and the cypress, creep almost upon the very surface: in some trees they run straight and horizontally, as in the laurel and the olive; while in others they have a sinuous course—the fig for example. In some trees the roots are bristling with small filaments, as in the fir, and many of the forest trees; the mountaineers cut off these fine filaments, and weave with them very handsome flasks,[2547] and various other articles.