WALNUT (Cayuri), _Juglans australis_, Grisb.—15 metres in height by 1 metre in diameter, with timber equal to European walnut. This valuable tree, which ought to be cultivated on a large scale, is gradually vanishing from our woods without any attempt at reafforestation. We shall become aware of its industrial value only when it has completely disappeared. It is suitable as a stock tree in afforestation and as an auxiliary in reafforestation. RED QUEBRACHO, _Loxopterigium Lorentzii_, Grisb.—A valuable tree, 15 metres in height by 2 metres in diameter, its timber is greatly prized for building purposes, and possesses so much tannin that it is largely exploited in the Chaco forests. It is slow of growth, and, therefore, measures for its multiplication are indispensable, so as to avoid exhausting this source of wealth. It is one of the best stock kinds for reafforestation, a third being planted with species of a more rapid growth. It multiplies naturally if care is taken to prevent forest fires and to leave always a few full-grown trees standing. Red Quebracho timber is hard, heavy, and not easily worked. It is used especially for railway sleepers, posts, columns, frames, etc. It is nicely veined, and heavy furniture can be made from it. Buried or in water it keeps for many years. TIPA (Hardwood), _Machærium Tipa_, Benth.—A tree from 20 to 25 metres in height, very leafy. Its timber is used for different household purposes. A splendid avenue tree, but very third-rate as a forest tree. The seeds are sown in rows, once ripe: 1st and 4th regions. MORA (Mulberry), _Maclura Mora_, Grisb.—From 15 to 20 metres in height by 1 metre in diameter. Furnishes yellowish, fine-grained timber, which is used for the manufacture of elegant furniture. Well seasoned, the wood is the colour of mahogany. An excellent auxiliary tree in the subtropical, Pampean and Northern Andean regions. In mixed woods it may be stock or prevailing tree, according to the kinds grown with it. It may also be used for woodland cutting. It is sown in rows, or grown in nurseries for two years, when the young plants are transplanted. PALO DE SAN ANTONIO, _Myrsine floribunda_.—15 metres in height by 0·75 metre in diameter, with a straight trunk and springy wood, which is used principally for making staves. To be sown in rows as an auxiliary, in mixed woods, in the 1st, 2nd and 4th regions. CEBIL, _Piptadenia Cebil_, Grisb., _P. communis_, Benth.—A tree of 20 to 25 metres in height by over 1 metre in diameter. Grows in the subtropical Andean and Northern Pampean regions. Excellent timber, but can only be utilized when quite seasoned, and is used principally for joinery. To be sown as stock trees in furrows or small holes.