CHAPTER XX UNDERNEATH THE GROUND For several days after the adventure with the bear Roger had no opportunity of going to the glade where the spring bubbled up, in order to find, if possible, what object the two engineers had in drilling there. Adrian was obliged to busy himself with various duties about the farm and garden, in order to get ready for the advanced spring planting, and Roger felt that he ought to help his cousin. But, all this time, Roger was busy thinking how he might accomplish his object, and get some of that mysterious substance which Mr. Dudley and Mr. Ranquist examined so eagerly. He thought of a number of plans, but rejected them all as impracticable. Most of them would have necessitated the bringing in of some one to help him, and this he did not want to do. Even when busiest at his tasks with Adrian, his mind was continually on this one subject, and, after a few days, it seemed it would be impossible for him, with his own unaided efforts, to dig down into the earth and find what was beneath the surface. But Roger was not a boy who gave a thing up because it was difficult. One night, after a somewhat hard day in the garden, during which the boys had set out a lot of cabbage plants, and hoed the early beans, they were sitting in the parlor, Adrian showing Roger some books. One was a sea story, and there was a picture of a sailor heaving the log, in the old-fashioned way. Roger glanced at the reading matter, which told how, on board ship, the lead was sounded, and how the speed of the ship, as well as the depth of the water through which she was sailing, was ascertained. The tale went on to relate how sometimes, the sailors used a piece of lead, with a hollow scooped in the lower end, into which space they would place some tallow. Then they would throw the weighted line overboard, and when the lead struck bottom, some of the mud and shells, of which the ocean bed is composed, would adhere to the grease in the hollow, scooped-out place. When the sinker was hauled to the surface and examined, experienced seamen could tell what sort of an anchorage they might find. Roger started when he read this. He glanced over it again, carefully, and his heart beat suddenly, at the idea which came to him. His cheeks burned red with the happy thought, and he was almost afraid that Adrian would see his excitement, and question him. He made an excuse to go to his room, and busied himself there some time before he blew out his light and went to bed. [Illustration: "His heart beat suddenly at the idea which came to him"] He dreamed, that night, of climbing down into a deep, dark mine, which sparkled and glittered with the gold and diamonds lining the steep sides. The next day Roger made a hasty breakfast. To his relief Adrian did not ask him to help with the farm work, nor did the country lad suggest, as he often did, a tramp through the woods; and Roger was very glad, for he had a plan to put in operation.