On the other hand, the wood of the cucus[853] is held in very high esteem. It is similar in nature to the palm, as its leaves are similarly used for the purposes of texture: it differs from it, however, in spreading out its arms in large branches. The fruit, which is of a size large enough to fill the hand, is of a tawny colour, and recommends itself by its juice, which is a mixture of sweet and rough. The seed in the inside is large and of remarkable hardness, and turners use it for making curtain rings.[854] The kernel is sweet, while fresh; but when dried it becomes hard to a most remarkable degree, so much so, that it can only be eaten after being soaked in water for several days. The wood is beautifully mottled with circling veins,[855] for which reason it is particularly esteemed among the Persians. CHAP. 19.—THE EGYPTIAN THORN. No less esteemed, too, in the same country, is a certain kind of thorn,[856] though only the black variety, its wood being imperishable, in water even, a quality which renders it particularly valuable for making the sides of ships: on the other hand, the white kinds will rot very rapidly. It has sharp, prickly thorns on the leaves even, and bears its seeds in pods; they are employed for the same purposes as galls in the preparation of leather. The flower, too, has a pretty effect when made into garlands, and is extremely useful in medicinal preparations. A gum, also, distils from this tree; but the principal merit that it possesses is, that when it is cut down, it will grow again within three years. It grows in the vicinity of Thebes, where we also find the quercus, the Persian tree, and the olive: the spot that produces it is a piece of woodland, distant three hundred stadia from the Nile, and watered by springs of its own. (10.) Here we find, too, the Egyptian[857] plum-tree, not much unlike the thorn last mentioned, with a fruit similar to the medlar, and which ripens in the winter. This tree never loses its leaves. The seed in the fruit is of considerable size, but the flesh of it, by reason of its quality, and the great abundance in which it grows, affords quite a harvest to the inhabitants of those parts; after cleaning it, they subject it to pressure, and then make it up into cakes for keeping. There was formerly[858] a woodland district in the vicinity of Memphis, with trees of such enormous size, that three men could not span one with their arms: one of these trees is remarkable, not for its fruit, or any particular use that it is, but for the singular phænomenon that it presents. In appearance it strongly resembles a thorn,[859] and it has leaves which have all the appearance of wings, and which fall immediately the branch is touched by any one, and then immediately shoot again. CHAP. 20. (11.)—NINE KINDS OF GUM. THE SARCOCOLLA.