_P. Benthamiana_, Hartw.—From California. 70 metres in height by 2 metres in diameter. Good timber. _P. excelsa_, Wall.—From the Himalayas. 40 metres in height. _P. Jeffreyana_, V. H.; _P. Lambertiana_, Doug.; _P. Sabiniana_, Doug.; and _P. Torreyana_, all from California. _P. Strobus_, L.—From North America. A hardy tree 40 metres in height by 1 metre in diameter. The Californian species might be tried in the 4th, 5th, 6th and 8th regions. The Himalayan species on the mountain ranges of the 2nd, 3rd, 4th and 5th, and the last-named species in the 5th, 6th and 8th. That from the Carolinas might be grown together with _P. insignis_. To be grown in woods of the same kind in the same regions and in the same way as those we have. PLANERA CRENATA, Desf.—A tree from the Caucasians; excellent timber and very hardy. Grown like the elm and in the same regions. CAUCASIAN WALNUT TREE, _Pterocarya caucasica_ and _P. Spachiand_.—Trees 20 metres in height, magnificent timber and suitable for intermingling with other walnut trees, especially Carya species. SEQUOIA.—From California, where it grows to 80 or 100 metres in height by 5 or 6 metres in diameter. The species _S. gigantea_ is that which attains the greatest size; the _S. sempervirens_ is more modest and less exacting about the nature of the soil and its situation. The former requires porous, deep and rather clayey soil, situated on hills or in ravines. To be tried in the 3rd and 6th regions and on the mountains in the 4th and 5th. Grown as the pine. LIME TREE.—The different European and North American species, _Tilia argentea_, Desf., _T. nigra_, Burk, and _T. silvestris_ from Europe, might be planted in the 5th, 6th and 7th regions in heavy, porous, clay soil. _Tsuga douglasi_ (Fir).—From Colorado State, North America. Attains a height of 50 metres and furnishes excellent timber. Suitable for planting woods together with spruces and firs, and grown in the same way. AMERICAN ELM TREE, _Ulmus americanus_, L.—This is a very hardy species at least 30 metres high. Its timber, though not so very good, is yet used in carriage-building and the like. Grown like other elm species and in the same regions. Lest it should be thought that a disproportionate amount of space has been allotted here to this matter of forestry it must be pointed out that timber of all kinds constitutes one of the greatest of the still latent treasures of the River Plate. A treasure which could be easily realized but which has hitherto been extraordinarily neglected not only in practice but even by most writers on the countries in question.