The dried _juice_ of the _unripe fruit_ of Egyptian mimosa is called _acacia_, and is to this day much used in medicine by the Egyptians. It is sometimes imported into this country in roundish masses, wrapped in thin bladders; and is externally of deep brown colour, and of a yellowish or reddish brown within. 274. _MYRRH is a gummy, resinous substance, obtained from a tree which grows in Abyssinia, Arabia, and other countries of the East, but respecting which we are hitherto possessed of no certain account. Mr. Bruce, however, imagined it to be a species of mimosa._ This drug is generally imported in a kind of grains, of irregular form; of brownish or reddish yellow colour, and somewhat transparent. Its smell is aromatic; and its taste is pungent and bitter. In its medicinal effects, myrrh, when taken into the stomach, is supposed to warm and strengthen it, and also to strengthen the other viscera. It is believed to resist putrefaction in all parts of the body; and, hence, has been recommended as a medicine in malignant, putrid, and pestilential fevers; and in small-pox. At the East India Company's sales this drug is sold at the rate of about twenty pounds per hundred weight. It is, however, liable to great abuses. The larger masses, in particular, are frequently an artificial composition, skilfully incrusted with a coat of myrrh. DIOECIA. 275. _MANNA is a concrete or dried juice, procured from several species of ash-tree, but particularly from the_ FLOWERING ASH (Fraxinus ornus, Fig. 76), _which is much cultivated in Calabria and Sicily._ _This tree somewhat resembles the common ash. It has winged leaves, with an odd one at the end, the leaflets oblong, pointed, serrated, and veined, standing on footstalks, and of bright green colour. The flowers are whitish, and appear in close bunches, about the month of May or June._