The _tierra caliente_ comprises a fringe of low plains which extend inland from the coast a distance varying from a few miles in width to a hundred or more. From thence it rises by a succession of terraces until the great inland plateaus are reached. The higher the altitude the lower the temperature, and it is estimated that there is a change of 1.8 degree Fahrenheit for each sixty feet of elevation in this region. This zone is characterized by the grandeur and variety of vegetable life, and it is an almost uninterrupted forest except where it has been cleared. A ride through the tropics is a revelation of what nature can do when aided by a never-ending succession of warm sunshine and abundant rain upon rich soil. Trees of great height and size are interspersed among plants which are generally of a tree-like nature, and are conspicuous for the development of their trunks and ramifications. The innumerable species of reeds and creeping plants that entwine themselves in a thousand different ways among the trees and plants make a passage almost impossible. It is for this reason that the natives always go around armed with the _machete_, a long blade very much like a corn-cutter, for it enables them to cut their way through the dense undergrowth, and is a protection, should any danger be encountered. The palms which are ever associated with the tropics are seen in great profusion and in countless varieties. Millions of ferns and broad-leaved plants which would be welcomed in the gardens and groves of northern homes are wasting their graceful beauty in these jungles and wildernesses. Trees are covered with beautiful orchids and vines coil about the trunks and limbs like great snakes, and then drop down to the earth and take root again in the damp soil.