Van Dorn whistled softly. "Could you assume the Irish dialect, on an occasion like this, Mr. Van Dorn?" Jack inquired. "An' shure," exclaimed Van Dorn, with the broadest accent imaginable, "an' will yez be afther tellin' me, be-dad! why I should not shpake me own mither tongue?" Both Houston and Jack laughed at Van Dorn's ready answer. "You will do," Jack said quietly, but in a tone so rich and musical as to chain the attention of his guests while he proceeded to plan the details of their visit to the mine. In an hour or two, the modus operandi had been fully decided upon, and nothing remained but to fix the night for their expedition, and this it was thought best to leave to be determined by circumstances the following week. The instruments needed for taking measurements were to be taken down beforehand by Houston, and concealed in a safe place near the mine, and on the night of the examination, he was to go from the house directly to the mine, where he would be joined by Jack and Van Dorn, the latter dressed in a suit of Mike's mining clothes, and personating him as closely as possible. All arrangements being now as nearly complete as possible, Houston and Van Dorn bade their host a cordial good night, and walked cheerfully homeward, in the cool, night air, under the star-lit sky, all unconscious of a pair of eyes, which from behind a large rock, had eagerly watched for their appearance, and followed their every movement. CHAPTER XXXIII. As Houston and Van Dorn disappeared around a turn in the road, the figure of Haight emerged into the starlight from behind a large rock where he had been concealed most of the time during their stay at the cabin. Incidently he had seen them on their way to visit Jack, and the lateness of the hour combined with the direction in which they were going, aroused his curiosity to such a degree that he followed them at a distance, and having seen them enter the cabin, his suspicious nature was at once on the alert. "I guess I'll find out what in the devil this means," he said to himself, as he paused behind a rock at a little distance, determined to ascertain what he could regarding their movements. It was a long and wearisome watch; once or twice he ventured near the cabin, to see whether by closer observation he could obtain any clue to what might be going on within, but the closely shaded window gave no sign, and beyond an occasional low murmuring of voices, nothing disturbed the silence, except once a low, ominous growl from Rex, as he caught sight of Haight's skulking figure from his station just outside the door. When at last the door opened, and Houston and Van Dorn stepped forth into the calm night, the lynx-eyed watcher failed to detect anything beyond a friendly leave-taking, after which the two walked homeward, chatting in the most commonplace manner imaginable.