"Yes, largely by elimination. There are no hollow walls, no false locks, no sliding panels,--it seems to me there is no logical hidden entrance, but through one of those columns," and he pointed to the great bronze columns that flanked the doorway. "By golly!" and Stebbins stared at the speaker. "You've hit it, sir!" "I could, of course, find the secret spring, which must be concealed in the ornamentation," Wise went on, "but I've hesitated to draw attention to the columns by working at them. Suppose we let Mr. Stebbins tell us, and not try to find what we know must be cleverly concealed." "But wait a minute," pleaded Hardwick. "I'm terribly interested in this proof of Mr. Wise's perspicacity. You needn't touch the column, but tell us your theory of its use. Is there a sliding opening in the solid bronze?" "I think not," and Wise smiled. "I may be all wrong, I really haven't looked closely, but my belief is that one or both of those great columns, which, as you see, are half in and half out of the hall, must swing round, revolve, you know,--and so open a way out." "Exactly right!" and Stebbins sprang toward the column that was on the side of the hall toward the Room with the Tassels. "That's the secret. Nobody ever so much as dreamed of it before! See, you merely press this acorn in this bronze oak wreath, half-way up, press it pretty hard, and the column swings round." They crowded closer to see, and learned that the column was made in two half sections, one in the hall and one outside. These, again, were divided horizontally, about seven feet above the floor, and the joint concealed by a decorative wreath of bronze oak boughs. The column was hollow, and one half the shaft revolved within the other, which, in turn, revolved over the first, so that by successive movements of the two, one could pass right through the vestibule wall, and close the opening after him, leaving no trace of his entry or exit. The vestibule wall, of mahogany, concealed the longitudinal joint in the column when closed. The doors were hinged to this wooden wall, and were opened and closed, and locked, quite independently of the columns. Owing to perfectly adjusted ball bearings, and a thoroughly oiled condition, the mechanism worked easily and soundlessly. "The whole contraption was brought from Italy," Stebbins informed them, "by the original Montgomery. I don't think he ever used it for any wrong doings, though they do say, soldiers was smuggled through in war times, and contraband smuggling went on, too. But those is only rumours and probably exaggerated." "You exaggerated the ghost stories, too, didn't you, Mr. Stebbins?" asked Wise.