As soon as he decides where the line is to go the engineer calls to the machéteros and the two best ones immediately begin cutting toward the sound of his voice. They soon slash a narrow path to him, drive a stake where he was standing and then turn back toward the other machéteros, who have been following them, cutting a wider path and clearing away all trees, vines and branches, so that the transit man can see the flag at the stake. The moment the leading machéteros reach him the chief starts off again and by the time the main body of axemen have reached his former position the head machéteros are cutting toward the sound of his voice in a new position.
As soon as the line is cleared the transit man takes his sight and moves ahead to the stake, the chainmen follow and drive stakes every hundred feet, and the leveller follows putting in elevations and cross sections. In this way the work goes on from early morning until nearly dark, stopping about an hour for lunch.
After the day's work comes the dinner, the table graced with wild hog, or turkey, or venison, or all. After dinner the smoke, then the day's notes are worked up and duplicated and all hands get into their nets. For a moment the countless nocturnal noises of the great forest, enlivened perhaps by the scream of a tiger, or the deep, muffled roar of a puma, fall upon drowsy ears, then follows the sleep that always accompanies hard work and good health, till the bull-voiced howling monkeys set the forest echoing with their announcement of the breaking dawn.
In reconnoissance and preliminary work the experienced engineer, is able, in many cases, to avoid obstacles without vitiating the results of his work, but in the final location, in staking out absolute curves and driving tangents thousands of feet long across country, no dodging is possible.
On the hills and elevated ground the engineer can, comparatively speaking, get along quite comfortably, his principal annoyances being the uneven character of the ground, which compels him to set his instrument very frequently, and the necessity of felling some gigantic tree every now and then.
In the valleys and lowlands there is an unceasing round of obstacles. The line may run for some distance over level ground covered with a comparatively open growth, then without warning it encounters the wreck of a fallen tree, and hours are consumed hewing a passage through the mass of broken limbs and shattered trunk, all matted and bound together with vines and shrubbery. A little farther on a stream is crossed, and the line may cross and recross four or five times in the next thousand feet. The engineer must either climb down the steep banks, for the streams burrow deep in the stiff clay of these valleys, ford the stream and climb the opposite bank, or he must fall a tree from bank to bank and cross on its slippery trunk twenty or twenty-five feet above the water.
Either on the immediate bank or in its vicinity is almost certain to be encountered a "saccate" clearing. This may be only one or two hundred feet across or it may be a half a mile. In the former case the "saccate" grass will be ten or fifteen feet in height and so matted and interwoven with vines and briars that a tunnel may be cut through it as through a hedge. If the clearing be large, the tough, wiry grass is no higher than a man's head, and a path has to be mowed through it, while the sun beats down into the furnace-like enclosure till the blade of the machéte becomes almost too hot to touch.
But worse than anything thus far mentioned are the Silico or black palm swamps. Some of these in the larger valleys and near the coast are miles in extent.
Occupied exclusively by the low, thick Silico palms, these swamps are in the wet season absolutely impassable except for monkeys and alligators, and even at the end of the dry season the engineer enters upon one with sinking heart as well as feet, and emerges from it tired and used up in every portion of his anatomy. It is with the utmost difficulty that he finds a practicable place to locate his instrument, generally utilizing the little hummocks formed by the trunks of the clusters of palms, and in moving from point to point he is compelled to wade from knee to shoulder deep in the black mud and water.
General reconnaissances from high trees in elevated localities, simple enough in theory, are by no means easy in a country so miserly with its secrets as this, nor are their results reliable without a great expenditure of time, labor, and patience.