The sudden changes incident to the mountain atmosphere were evidenced in the opaque density of the fog that had ensued on the crystalline clearness of the sunset. It hung like a curtain from the zenith to the depths of the valley, obscuring all the world. It had climbed the cliffs; it was shifting in and out among the pillars of the veranda; it even crossed the threshold as the door was opened, then shrank back ghostly-wise, dissolving at the touch of the warm home radiance. As the lamp-light flickered out, illuminating its pervasive pallor, the new-comer urged a very lame horse to the steps of the veranda. The two friends waiting within looked at each other in uncertainty as to their policy in admitting the stranger. Then as his rapid footfalls sounded on the veranda, and a stalwart figure appeared in the doorway, Briscoe tilted the shade of the lamp on the table to throw its glare full on the new-comer's face, and broke forth with an acclaim of recognition and welcome. To be sure, he was but a casual acquaintance, and Briscoe's cordiality owed something of its fervor to his relief to find that the visitor was of no untoward antecedents and intentions. An old school-fellow he had been long ago in their distant city home, who chanced to be in the mountains on a flying trip--no belated summer sojourner, no pleasure-seeker, but concerned with business, and business of the grimmest monitions. A brisk, breezy presence he had, his cheeks tingling red from the burning of the wind and sun and the speed of his ride. He was tall and active, thirty-five years of age perhaps, with a singularly keen eye and an air intimating much decision of character, of which he stood in need for he was a deputy collector of the revenue service, and in the midst of a dangerous moonshining raid his horse had gone dead lame. "I hardly expected to find you still here at this season," he said to Briscoe, congratulating himself, "but I took the chances. You must lend me a horse." Briscoe's instincts of hospitality were paramount, and he declared that he would not allow the new-comer to depart so summarily. He must stay and dine; he must stay the night; he must join the hunt that was planned for to-morrow--a first-rate gun was at his disposal. "I'll get you back to Glaston without delay. I'll let you drive the dog-cart with Fairy-foot, the prettiest bit of horse-flesh that ever wore a shoe--trots to beat the band! You can hunt all day with Bayne and me, and a little before sunset you can start for Shaftesville, and she will whisk you there in an hour and a quarter, twenty miles. You needn't start till five o'clock to catch the seven-ten train, with lots of time to spare." In spite of all denial, the telephone bell was presently jangling as Briscoe rang up the passenger-agent at the railroad depot in the little town of Shaftesville, twenty miles away.