In the Frigid Zone life seems almost extinguished during the greater part of the year by the rigors of an almost perpetual winter. The vegetation of the polar regions is stunted, dull, and monotonous in color, and inadequate to sustain animal life. The plains are covered with mosses and lichens, and here and there a few herbs and shrubs (saxifrages, gentians, papaver, etc.), but no stately forest trees. In short, the general characteristic of these cold regions is the preponderance of cryptogamous plants. In the Temperate Zone we have a marked superiority in vegetable life. Here we have grassy pastures, cerealia, and dicotyledonous trees--the oak, ash, beech, maple, chestnut, walnut, the apple, pear, plum, etc. The number of genera and species is greatly increased, and the superior types acquire a fuller development. The preponderance of phanerogamous plants, the richer coloring, and the appearance of evergreen trees, are the signs of an immense progress. But the soft tints, the medium forms, and the wintry sleep extending through half the year, clearly indicate that the perfection of physical nature is not attained.[390] It is in the heat of the Torrid Zone where nature puts forth all her energy, and displays her greatest resources. "The cryptogamous plants attain, in arborescent forms, the proportions of our forest trees. The grasses which we know in our climates only under the humble forms they put on in our fields, rise, in the elegant and majestic bamboo, to the height of sixty or seventy feet. A single tree is a garden, wherein a hundred different plants intertwine their branches, and display their brilliant flowers on a ground of verdure, where their varied hues and forms of leaves are richly blended." And here the perfection of vegetable life is attained in the graceful palms which stand at the head and crown the vegetable kingdom. This is the region of a perpetual summer, where nature makes ample provision for the support of animal life, and the date, the cocoa-nut, the banana, the plantain, the sugar-cane, the pine-apple, supply all the wants of uncivilized man.