_A. bracteata_, Hook and Arn.—From the mountains of Santa Lucia. 50 metres in height by 1 metre in diameter. _A. concolor_, Lindl.—From the Rocky Mountains, where they grow to 30 or 40 metres in height by 1 metre in diameter. These two species should be tried in the 3rd, 4th, 5th and 6th regions. _A. grandis_, Lindl.—From the northern states of the Union. Attains a height of 90 metres by 1 or 2 metres in diameter, 3rd, 4th and 6th. _A. magnifice_, Murr., and _A. mobilis_, Lindl.—From California and Oregon, where it grows to a height of 70 to 80 metres by 2 or 3 metres in diameter; 2nd and 3rd regions, and the hills in the 4th and 5th. _A. pectinata_, D. C.—From Europe. 40 metres in height by 1 metre and sometimes more in diameter; 3rd, 5th, 6th and 9th regions. _A. religiosa_, Lindl.—From Mexico. Attains 40 to 50 metres in height by 1 or 2 metres in diameter; 2nd and 3rd regions. All fir trees require hilly ground already stocked with trees. It is useless to plant them on the open plain. Other conifers, known also as firs, belong to the genera _Picea_ and _Tsuga_. MAPLE TREE.—The _Acer campestre_ and _A. platanoides_.—From Europe, appear to be suited for our 3rd, 4th, 5th, 6th and 7th regions, the latter as a stock species. Thirty feet high. The _A. eriocarpum_, Michx., and _A. rubrum_, Michx., are two handsome species from North America, where they grow to a height of 20 to 35 metres by 1 metre in diameter. To be essayed in the same regions as the preceding trees. They require deep soil and are cultivated like the sycamore maple. ALDERS. The _Alnus cordifolia_, Ten.—From Europe, and _A. orientalis_, Dcne., from Asia. Would grow well in the 7th region and on the shores of the 5th, 6th and 9th. ARAUCARIAS. The _Araucaria Bidwilli_, Hook, and _A. Cunninghami_, Ait., both from Eastern Australia. Grow to a height of 50 to 60 metres and give excellent timber; 2nd, 3rd and 4th regions. _A. excelsa_, R. Br.—From Norfolk Island. Attains a height of 70 metres by 1 metre and over in diameter; 2nd, 3rd and 4th regions. _A. Cookii_, E. Br., and _A. mulleri_, R. Br.—From New Caledonia; 40 metres in height; 1st, 2nd and 4th regions. All grow on deep, humid soil, rich in vegetable mould, like certain parts of the Chaco and of the 1st and 2nd regions. BIRCHES.—Valuable trees for the 3rd, 4th, 5th, 6th, 7th and 9th regions. Do not exceed 30 metres in height on the best soil, but very hardy and reach a metre in diameter. The best species are _Betula alba_, _B. nigra_, _B. lenta_ and _B. pubescens_.