This tree is cultivated in Spain and Italy[638] for the young shoots and leaves, which are dried and made into a powder for tanning. I recently saw a plantation in Sicily, of which the product was exported to America. As oak-bark becomes more rare and substances for tanning are more in demand, it is probable that this cultivation will spread; all the more that it is suitable to sandy, sterile regions. In Algeria, Australia, at the Cape, and in the Argentine Republic, it might be introduced with advantage.[639] Ancient peoples used the slightly acid fruits as a seasoning, and the custom has lingered here and there; but I find no proof that they cultivated the species. It grows wild in the Canaries and in Madeira, in the Mediterranean region and in the neighbourhood of the Black Sea, preferring dry and stony ground. In Asia its area extends as far as the south of the Caucasus, the Caspian Sea, and Persia.[640] The species is so common that it may have been in use before it was cultivated. Sumach is the Persian and Tartar name;[641] _rous_, _rhus_, the ancient name among the Greeks and Romans.[642] A proof of the persistence of certain common names is found in the French “Currier’s _roux_ or _roure_.” +Khât+, or +Arab Tea+—_Catha edulis_, Forskal; _Celastrus edulis_, Vahl. This shrub, belonging to the family of the _Celastraceæ_, is largely cultivated in Abyssinia, under the name of _tchut_ or _tchat_, and in Arabia under that of _cat_ or _gat_. Its leaves are chewed, when green, like those of the coca in America, and they have the same exciting and strengthening properties. Those of uncultivated plants have a stronger taste, and are even intoxicating. Botta saw that in Yemen as much importance is attributed to the cultivation of the _Catha_ as to that of coffee, and he mentions that a sheik, who is obliged to receive many visits of ceremony, bought as much as a hundred francs’ worth of leaves a day.[643] In Abyssinia an infusion is also made from the leaves.[644] In spite of the eagerness with which stimulants are sought, this species has not spread into the adjoining countries, such as Beluchistan, Southern India, etc., where it might succeed. The _Catha_ is wild in Abyssinia,[645] but has not yet been found wild in Arabia. It is true that the interior of the country is nearly unknown to botanists. It cannot be ascertained from Botta’s account whether the wild plants he mentions are wild and indigenous, or escaped from cultivation and more or less naturalized. Perhaps the _Catha_ was introduced from Abyssinia with the coffee plant, which likewise has not been discovered wild in Arabia. +Maté+—_Ilex paraguariensis_, Saint-Hilaire.