_E. occidentalis_, Smith.—From Western Australia. Like E. globulus, can be grown near the sea coast. Generally it does not exceed 40 metres in height by 1 metre in diameter. _E. pauciflora_, Sieb.—Southern Australia and Tasmania. From 50 to 60 metres in height by 2 metres in diameter, wood of excellent quality. One of the best cold-resisting species. _E. Pilularis_, Smith.—Southern Queensland and New South Wales, 100 metres in height and 4 metres in diameter; wood of excellent quality. _E. viminalis_, Labill.—Southern Australia, where it grows to a height of 100 metres by 3 or 4 metres in diameter. All these species have been imported and planted in different places. Some, on the one hand, and others, on the other, probably have been lost, the remainder are mixed to such a degree that at present no information can be given about them without falling into error. All the species mentioned and some others were planted in “3 de Febrero” Park, about the year 1875-76, in the clump which shaded the guanacos’ corral. At first they bore distinguishing numbers, but now nothing remains to designate them. Another nursery had been started on the other side of the railway to the Tigre, beside the avenue of palms, of which also we believe not a vestige remains. There also was a nursery of ombús, one of hardwood trees and a collection of American grape vines. ASH TREE, _Fraxinus excelsior_, L.—Europe. From 25 to 30 metres in height by 1 metre in diameter. Gives very elastic, white or yellow timber, greatly prized in carriage-building. Grows well in the 5th, 6th and 7th regions. The seeds are laid down as they ripen, sometimes they take two years to germinate, but when they fall naturally to the ground and are covered over by leaves in autumn they sprout well. On this account and that of its intrinsic value this tree is one of the best kinds for stocking tall and mixed woods. The best plan for afforestation is to sow the seeds in nursery beds and plant out the following year. BLACK ACACIA, _Gleditschia triacanthos_.—A thorny North American tree; here growing to a height of 25 metres by 0·70 metre in diameter. Its wood is excellent for cabinet-making. Sown in rows as an auxiliary—on account of its thorns. It gives a quantity of edible pods like that of the carob tree. It grows well in the 3rd, 4th, 5th, 6th, 7th and 8th regions.