In the country of the Troglodytæ, the Thebais, and the parts of Arabia which separate Judæa from Egypt, myrobalanum[570] is commonly found; it is provided by Nature for unguents, as from its very name would appear. From its name, also, it is evident that it is the nut of a tree, with a leaf similar to that of the heliotropium, which we shall have to mention when speaking of the herbs. The fruit of this tree is about the size of a filbert. The kind that grows in Arabia is known as Syriaca, and is white, while, on the other hand, that which grows in the Thebais is black: the former is preferred for the quality of the oil extracted from it, though that which is produced in the Thebais yields it in larger quantities. Among these various kinds, that which is sent from the country of the Troglodytæ is the worst of all. There are some persons who prefer that of Æthiopia[571] to all of these, the nut of which is black, and not oleaginous; it has only a very small kernel, but the liquid which is extracted from it is more odoriferous than that of the other kinds; it grows, too, in a champaign, open country. It is said that the Egyptian nut is even more oleaginous, being of a reddish colour with a thicker shell, and that the plant, although it grows in wet, marshy spots, is shorter and drier than the other kinds. The Arabian nut, again, is said to be of a green colour and of smaller size, but harder and more compact, from the circumstance that it grows in mountainous districts. The best of all, however, is that of Petra, which comes from a city mentioned[572] on a previous occasion; it has a black shell, but the kernel is white. The perfumers, however, only extract the juices from the shells; but medical men pound the kernels, pouring warm water on them, little by little, as they do it. CHAP. 47. (22.)—PHŒNICOBALANUS. The fruit of the palm in Egypt, which is known by the name of adipsos,[573] is put to a similar use in unguents, and is held next in esteem after the myrobalanum. It is of a green colour, has exactly the smell of a quince, and has no stone or nut within. It is gathered a little before it begins to ripen. That which is left ungathered is known as phœnicobalanus;[574] it turns black, and has a tendency to inebriate the person who eats of it. The price of myrobalanum is two denarii per pound. The shop-keepers give this name also to the dregs of the unguent that is made with it. CHAP. 48.—THE SWEET-SCENTED CALAMUS;[575] THE SWEET-SCENTED RUSH.