David Elden smoked his after-dinner cigar in his bachelor quarters. The years had been good to the firm of Conward & Elden; good far beyond the wildness of their first dreams. The transaction of the section bought from the English absentee had been but the beginning of bigger and more daring adventures. That section was now considered close-in property, and lots which Conward & Elden had originally sold for two hundred dollars each had since changed hands at more than a thousand. The street railway ran far beyond it. Water mains, sewers, electric lights, graded streets and concrete sidewalks had sprawled for miles across the prairie. Conward, in that first wild prophecy of his, had spoken of a city of a quarter of a million people; already more lots had been sold than could be occupied by four times that population. It had been a very marvellous development; an enthusiasm which had grown deeper and wilder until it swept along as an insane abandon, bearing in its current the last vestiges of conservatism and caution. For at last the old-timers, long alluded to as the "dead ones," had come in. For years they had held back, scoffing, predicting disaster; and while they held back venturesome youths had become millionaires. One can stand that only so long, and at last the old-timers were buying and selling and debauching with the others in the lust of easy money. Dave had often asked himself where it all would end. He traced it from its beginning; from the day when he wrote his first "boost" story; from the hundred-dollar bill that Conward had placed in his hands. It was a simple course to trace; so simple now that he was amazed that only Conward and a few shrewd others had seen it at that time. It had begun with the prosperity of incoming money; the money of a little group of speculators and adventurers and the others who hung on their train. They had filled the few hotels and office buildings. Presently some one began to build a new hotel. Labour was scarce and dear; carpenters, masons, bricklayers, plumbers, plasterers, labourers, had to be brought in from the outside. There was no place for them to sleep; there was no place for them to eat; there were insufficient stores to supply their wants. More hotels and shops and stores and houses had to be built, and to build them more carpenters and masons and bricklayers and plumbers and plasterers and painters had to be brought from the outside. The thing grew upon itself. It was like a fire starting slowly in the still prairie grass, which by its own heat creates a breeze that in turn gives birth to a gale that whips it forth in uncontrollable fury. Houses went up, blocks of them, streets of them, miles of them, but they could not keep pace with the demand, for every builder of a house must have a roof to sleep under. And there were streets to build; streets to grade and fill and pave; ditches to dig and sidewalks to lay and wires to string. And more houses had to