There are three different kinds of balsamum. The first has a thin and hair-like foliage, and is known by the name of eutheriston.[591] The second is of a rugged appearance, bending downwards, full of branches, and more odoriferous than the first; the name of this is trachy. The third kind is the eumeces, so called, because it is taller than the others; it has a smooth, even, bark. It is the second in quality, the eutheriston being inferior to the trachy. The seed of this plant has a flavour strongly resembling that of wine; it is of a reddish colour, and not without a certain amount of unctuousness; the grains of inferior quality are lighter in weight and of a greener hue: the branches of the shrub are thicker than those of the myrtle. Incisions are made in it either with glass, or else a sharp stone, or knives made of bone: it being highly injurious to touch the vital parts with iron, for in such case it will immediately wither away and die. On the other hand, it will allow of all the superfluous branches being pruned away with an instrument of iron even. The hand of the person who makes the incision is generally balanced by an artificial guide, in order that he may not accidentally inflict a wound in the wood beyond the bark. A juice distils from the wound, which is known to us as opobalsamum; it is of extraordinary sweetness,[592] but only exudes in tiny drops, which are then collected in wool, and deposited in small horns. When taken from out of these, the substance is placed in new earthen vessels; it bears a strong resemblance to a thick oil, and is of a white colour when fresh. It soon, however, turns red, and as it hardens loses its transparency. When Alexander the Great waged war in those parts, it was looked upon as a fair summer day’s work to fill a single concha[593] with this liquid; the entire produce of the larger garden being six congii, and of the smaller one a single congius; the price, too, at which it was sold was double its weight in silver. At the present day the produce of a single tree, even, is larger; the incisions are made three times every summer, after which the tree is pruned.