I have already alluded to the regions of saxifrages and mosses, or Wahlenberg’s region, which extends from the eternal snow of the poles, or the summits of the mountains, down to the limit of the growth of trees, and is distinguished by the absence of arborescent plants, and even of the taller shrubs. Adjoining this comes the great Linnæan region, including northern Europe and northern Asia to the great chain of mountains which extends from the Pyrenees to the Alps. Woods of conifers, or deciduous trees, luxuriant meadows, and broad heaths, in Asia the peculiar salt steppes, especially determine the characters of this region, which, at least in its European portion, is now too widely taken possession of to exhibit its natural physiognomy. The wide basin from the Alps to Atlas, the deepest part filled by the Mediterranean Sea, forms a third region, distinguished by the abundance of aromatic Labiate plants, fair, but fleeting, lily plants, and the resinous rock-roses. The solitary dwarf-palm and balsam-trees denote in this, De Candolle’s region, the transition to the tropics. Parallel to the two last-named regions, North America is divided into a northern region named in honor of Michaux, distinguished by peculiar conifers, oaks and walnuts, by innumerable asters and golden-rods from the Linnæan region, and a southern, Pursh’s region, in which most strikingly appear the trees with broad shining leaves and large splendid flowers, like the tulip-tree, the magnolia, and others defining the character. Between Kämpfer’s region, comprehending China and Japan, Wallich’s in the highlands of India, and the Polynesian, or island region of Reinwardt, renowned for its poison-tree and its giant-flower, lies Roxburgh’s region, which extends through both the Indian peninsulas, which conceals among the shadows of the monster fig-trees the _Scitaminaceæ_, or aromatic lilies, like ginger, cardamums, and turmeric, or in little woods of aromatic barks, like the cinnamon and cassia, matures in thick, shapeless stems the starch of the sago. We pass over Blume’s region in the mountains of Java, Chamisso’s in the Archipelago of the South Sea, and Forster’s region in New Zealand, and turn again to Africa, where the desert, Delile’s region, ripens, in the oases, the date, and in the tender-leaved acacias concocts the abundance of gum-arabic and senega, which commerce brings to the service of our industry. To this, eastward, adjoins Forskäl’s region, where the balsam-trees predominate; on the south, Adanson’s, the characteristic plant of which perpetuates the name of that enlightened botanist, the thousand-yeared giant stem of the _Adansonia digitata_, the baobab, or monkey’s-bread. The little known Africa gives only one more region, at its southern extremity, Thunberg’s, bedecked with stapelias, mesembryanthemums, brilliant heaths, and evil-scented becku-shrubs, but poor in woods. New Holland and Van Diemen’s Land bear the name of their first and most profound