The Arabians, it is said, make boats of this tree. Its wood is so hardened by the sea, and also so bitter in taste, that no worm whatever will touch it. Of this tree the Arabians also make tooth-picks, these they sell in small bundles at Mecca, and are reputed to be favourable to the teeth, gums, and breath. The reader will have observed frequent mention of some trees found in the desert which our camels would not eat. These are the Rack-tree, and the doom, or palma thebaica cuciofera[30]. These grow where they find salt springs in the sand; the desert being so impregnated with fossile salt in every part of it, that great blocks and strata of it are seen everywhere appearing above ground, especially about lat. 18°. The Rack something resembles the ash on its first appearance, though in the formation of its parts it is widely different. Its bark is white and polished, smooth, and without furrows. Its trunk is generally 7 or 8 feet before it cleaves into branches. I have seen it above 24 feet in height, and 2 feet diameter. Its leaves are, two and two, set on different sides, that is, each two perpendicular to each other alternately. The small branches that bear flowers part from the inside of the leaf, and have the same position with the leaves; that is, suppose the lowest pair of leaves and branches are on the east or west side of the tree, the pair above them will be on the north and south, and the next to these will be on the west as before. The leaves are long and very sharp-pointed; in the inside a deep green, and in the out a dirty white of a green cast; they have no visible ribs either in the inside or out. The cup is a perianthium of four petals, which closely confine the flower, and is only a little flat at the top. The flower is composed of four petals deeply cut, in the interstices of which is a small green fruit divided by a fissure in the middle; its colour is deep orange, with lights of gold colour, or yellow, throughout it. It has no smell, tastes very bitterly, and is never seen to be frequented by the bees. It is probable that a tree of this kind, tho’ perhaps of another name, and in greater perfection, and therefore more fit for use, may be found in some of our West India islands between lat. 15° and 18°, especially where there are salt springs and marshes. [Illustration: _Geshe el Aube_ _Heath. Sc._ _London Published December 1, 1789 by G. Robinson & Co._] GIR GIR, OR GESHE EL AUBE.