We steam out into the still night air, the heavy train bumping and jolting over level-crossings where stand groups of Mexican poor, children, and dogs; past rows of adobe huts, palm-thatched, and frowsy little _tiendas_ (general shops), where glimpses are caught in the oil-flare of trays of unspeakable eatables. It is stifling in the carriages, and we throw up the windows. The moon is rising, the night air is warm and scented--scented with a strange pungent, spicy scent--an indescribable perfume--the smell of the tropics. The train rolls heavily on between dark masses of bush and stunted cactus, topped by waving palm-leaves, and here and there banana plantations, heavy with the grass-green fruit. This is the _tierra-caliente_, "the hot-lands," the great belt of steaming miasmic country stretching some fifty miles ere we begin the climb up to the highlands of Central Mexico. It is hard to see much, but that long slope of undulating ground out there to the left is a coffee plantation, the dark-green bushes dotting the rounded hillside like tufts of wool on a Bushman's head. Now the train crawls, as a fly on the edge of a teacup, round a fertile crater-like valley. You can look right down into its green glories, where mid the leaves the moonlight touches into quicksilver the boisterous river which bubbles and froths like a Scotch stream in spate. Now we pass through acres of forest banking up each side so high that it is all blackness; while every few miles the mournful tolling of the engine bell heralds us into a wayside village, the lights streaming through the doors of whitewashed huts, and Indians, muffled to their eyes in blankets, standing in silent groups by the railside.