It is stated, also, that this substance is the produce of a shrub originally found in Carmania, and propagated by plants, by order of the Ptolemies, in the parts beyond Egypt; while other authorities are found, which say that it grows on the incense tree, and is gathered like gum, from incisions made in the bark, after which it is collected in bags of goat-skin. That of the most approved quality, sells at the rate of forty asses per pound. Ladanum is adulterated with myrtle berries, and filth taken from the fleeces of other animals besides the goat. If genuine, it ought to have a wild and acrid smell, in some measure redolent of the desert places where it is produced: it is dry and parched in appearance, but becomes soft the moment it is touched. When ignited, it gives a brilliant flame, and emits a powerful but pleasant odour; if mixed with myrtle berries, its spurious quality is immediately discovered by their crackling in the fire. In addition to this, the genuine ladanum has more grits, or stony particles, adhering to it, than dust. CHAP. 38.—ENHÆMON. In Arabia, too, the olive-tree distils a sort of tear, with which the Indians make a medicament, known by the Greeks as enhæmon;[541] it is said to be of wonderful efficacy in contracting and healing wounds and sores. These trees,[542] situate on the coasts there, are covered by the sea at high water, without the berries suffering the slightest injury, although it is a well-known fact, that the salt collects upon the leaves. All these trees are peculiar to Arabia, but it has some few besides, in common with other countries, of which we shall make mention elsewhere, the kinds growing in Arabia being of inferior quality. The people of that country have a wonderful regard for the perfumes of foreign parts, and import them from places at a considerable distance; so soon are men sated with what they have of their own, and so covetous are they of what belongs to others. CHAP. 39.—THE TREE CALLED BRATUS. Hence it is, that they import from the country of the Elymæi[543] the wood of a tree called bratus,[544] which is similar in appearance to a spreading cypress. Its branches are of a whitish colour, and the wood, while burning, emits a pleasant odour; it is highly spoken of by Claudius Cæsar, in his History,[545] for its marvellous properties. He states that the Parthians sprinkle the leaves of it in their drink, that its smell closely resembles that of the cedar, and that the smoke of it is efficacious in counteracting the effects of smoke emitted by other wood. This tree grows in the countries that lie beyond the Pasitigris,[546] in the territory of the city of Sittaca, upon Mount Zagrus. CHAP. 40.—THE TREE CALLED STOBRUM.