Whoever glances at the map of Central America will observe a vast region, lying between Chiapas, Tabasco, Yucatan, and the republic of Guatemala, and comprising a considerable part of each of those states, which, if not entirely a blank, is only conjecture that it is filled up with mountains, lakes and rivers. It is almost as unknown as the interior of Africa itself. We only know that it is traversed by nameless ranges of mountains, among which the...