Then, to the surprise of everyone, the doctor waked up and knew just where he wanted to go. He displayed an unexpected familiarity with the general topography of the hills. It puzzled Billy. And, to the vaster astonishment of both his confrères, Jim suddenly announced, with quite unwonted volubility, that he had been intending all along to start in prospecting at the end of this trip, and that here he meant to quit scouting and leave the society of his brothers in arms—unless, of course, he added, as a doubtful afterthought, they wanted to join him. They profanely replied that they did not.
Most of the men pushed on immediately to Rockerville, whither a majority of the former inhabitants of Frenchman's Creek had already emigrated. Alfred and Billy decided to get over in the Limestone for a "big hunt" before returning East. Prue said good-by to them with real feeling, and most of them threw out their chests and were very gruff and rude because they were sorry to leave. Prue understood. They were kind-hearted men, after all, these rough pioneers. Billy remembered for almost two years how she looked when she said that, which was extraordinary for Billy. He had led so varied a life as pony-express rider, stage-driver, scout, Indian, bronco-buster, hunter, and trapper, that he had little room in his memory for anything short of bloodshed or a triumph for himself.
Finally, after all the rest had gone, Jim and the doctor made the mutually delightful discovery that they had selected the same locality, the one for his prospecting, the other for his scientific investigations. So the doctor simply left his outfit in Jim's wagon, and they all went up together.
The little scientist was as excited as a child. To him the country was as a document—a document which he had studied thoroughly in the pocket editions. He now had it before him in the original manuscript, open and unabridged.
And indeed, even to an ordinary observer, the Black Hills are a strange series of formations.
They run north and south at the westernmost edge of the northern prairie, and are, altogether, about as large as the State of Vermont. Unlike other ranges, they possess no one ridge that serves as a backbone to the system. The separate peaks rise tumultuously, like the rip of seas in a tideway, without connection, solitary, sombre. Between them lie deep gorges, or broad stretches of grass-park, which dip away and away, until one catches the breath at the grand free sweep of them. Huge castellated dikes crop up from the ridge-tops like ramparts. Others rise parallel in the softest verdure, guarding between their perpendicular sides streets as narrow and clean-cut as the alleys of a city of skyscrapers.
Through it all, back and forth, like the walls of a labyrinth, run the broken, twisted, faintly defined geological systems, which cross each other so frequently and so vigorously that all semblance of order is lost in the tumultuous upheaval. Here are strata deposited by the miocene tertiary; here are breakings forth of metamorphic rocks of many periods; here are the complex results of diverse influences and forces. Down in the south is a great cavern—of which ninety-seven miles and twenty-five hundred rooms have, at this writing, been explored—which was once the interior of a geyser. For ages it spouted; for ages more its fluids crystallized and petrified into varied and beautiful forms; and then, finally, many layers of stratified rock were slowly overlaid to seal forever this dried-out, beautiful, lifeless mummy of a cave. It lies there now, as it has lain through the centuries, with a single, tiny opening by which it can be entered—a palace of vast re-echoing halls, hung with jewels, a horror-haunted honeycomb of unsounded depths, a solemn abode wherein not the faintest drip of water, not the gentlest sigh of air through the corridors, breaks the eternal silence. Only its mouth roars continually as the winds rush in or out. The Indians assign to it the spirits of their dead warriors, and cannot be induced to approach it. Geologists rave over it, and cannot be persuaded to come away.
But this is in the latter day of railroads and tenderfeet. At the time of which this story treats, little was known of the country. It was simply a great second-hand shop, of a little of everything in the geological line.
When the party arrived at Spanish Gulch, the doctor was so eager to get into the wonderful hills that only with the greatest difficulty did he constrain himself to help Jim erect a log cabin for the accommodation of his family. Even then he was not of much use, although he could at least help to lift timbers. Jim practically did it alone, and it took him almost a month; but when it was done, it was very nice. The doctor accepted the free gift of the scout's labor and skill quite as a matter of course, just as he had taken the free gift of an ordinarily expensive pilotage across the plains; but the woman appreciated, and perhaps she understood, for she suddenly became very shy in Jim's presence. And then, sometimes, she would gaze at him, when he was not looking, with an adoration of gratitude filling her eyes.
After the doctor's home was finished, Jim betook himself into another gulch, where he constructed a less elaborate shelter for his own occupation. Thenceforward he spent much of his time in mysterious prospecting operations; but two or three times a week he liked to sit perfectly silent under the tree which overshadowed the doctor's cabin, watching Prue, if she happened to be near, playing with Miss Prue, or trying to talk with the doctor. He never went inside the house, even in the winter; and he never seemed to try to know Prue any more intimately. It would have been difficult for him to say just what pleasure he discovered in these visits.