Archibald was as far from suspecting it as anybody; indeed, he most likely never troubled his head about builders' plans in his life. But he thought a great deal of his great-grandfather's portrait; and since it was so placed as to be in view of the most comfortable chair before the fire, he spent many hours of every week gazing at it. What was Sir Charles pointing at with that left forefinger? And what meant that peculiarly intent and slightly frowning glance which the painted eyes forever bent upon his own? Archibald probably had a few of Mrs. Radcliffe's romances along with the other valuable books on his shelves, and he may have cherished a notion that a treasure, or an important secret of some sort, was concealed in the vicinity. Following down the direction of the pointing finger, he found that it intersected the floor at a spot about five feet to the right of the side of the fireplace. The floor of the chamber was of solid oak planking, blackened by age; and it appeared to be no less solid at this point than at any other. Nevertheless, he thought it would be good fun, and at all events would do no harm, to cut a hole there, and see what was underneath. Accordingly, he quietly procured a saw and a hammer and chisel, and one day, when the family were away from home, he locked himself into his room, and went to work. The job was not an easy one, the tough oak wood being almost enough to turn the edge of his chisel, and there being no purchase at all for the saw. After quarter of an hour's chipping and hammering, with very little result, he paused to rest. The board at which he had been working, and which met the wall at right angles, was very short, not more than eighteen inches long, indeed, being inserted merely to fill up the gap caused by a deficiency in length of the plank of which it was the continuation. Between the two adjoining ends was a crack of some width, and into that crack did Archibald idly stick his chisel. It seemed to him that the crack widened, so that he was able to press the blade of the chisel down to its thickest part. He now worked it eagerly backward and forward, and, to his delight, the crack rapidly widened still further; in fact, the short board was sliding back underneath the wainscot. A small oblong cavity was thus revealed, into which the young discoverer glowered with beating heart and vast anticipations.
What he found could scarcely be said to do those anticipations justice; it was neither a casket of precious stones, nor a document establishing the family right of ownership of the whole county of Sussex. It was nothing more than a tarnished rod of silver, about nine inches in length, and twisted into an irregular sort of corkscrew shape. One end terminated in a broad flat button; the other in a blunted point. There was nothing else in the hole--nothing to show what the rod was meant for, or why it was so ingeniously hidden there. And yet, reflected Archibald, could it have been so hidden, and its place of concealment so mysteriously indicated, without any ulterior purpose whatever? It was incredible! Why, the whole portrait was evidently painted with no other object than that of indicating the rod's whereabouts. Either, then, there was or had been something else in the cavity in addition to the rod, or the rod was intended to be used in some way still unexplained. So much was beyond question.
Thus cogitated Archibald--that is to say, thus he might have cogitated, for there is no direct evidence of what passed through his mind. And, in the first place, he made an exhaustive examination of the cavity, and convinced himself not only that there was nothing else except dust to be got out of it, but also that it opened into no other cavity which might prove more fruitful. His next step was to study the silver rod, in the hope that scrutiny or inspiration might suggest to him what it was good for. His pains were rewarded by finding on the flat head the nearly obliterated figures 3 and 5, inscribed one above the other, in the manner of a vulgar fraction, thus, 3/5; and by the conviction that the spiral conformation of the rod was not the result of accident, as he had at first supposed, but had been communicated to it intentionally, for some purpose unknown. These conclusions naturally stimulated his curiosity more than ever, but nothing came of it. The boy was a clever boy, but he was not a detective trained in this species of research, and the problem was beyond his ingenuity. He made every application of the figures 3 and 5 that imagination could suggest; he took them in feet, in inches, in yards; he added them together, and he subtracted one from the other: all in vain. The only thing he did not do was to take any one else into his confidence; he said not a word about the affair even to Kate; being resolved that if there were a mystery, it should be revealed, at least in the first instance, to no one else besides himself. At length, after several days spent in fruitless experiments and loss of temper, he returned the rod to its hiding-place, with the determination to give himself a rest for awhile, and see what time and accident would do for him. This plan, though undoubtedly prudent, seemed likely to effect no more than the others; and over a year passed away without the rod's being again disturbed. By degrees his thoughts ceased to dwell so persistently upon the unsolved puzzle, and other interests took possession of his mind. The tragedy of his aunt's death, his love for Kate, his studies, his prospects--a hundred things gave him occupation, until the silver rod was half forgotten.
In the latter part of 1813, however, he accidentally made a rather remarkable discovery.
V.
He had for the first time been out hunting with his father and the neighboring country gentlemen in the autumn of this year, and it appears that on two occasions he had the brush awarded to him. At his request the heads of the two foxes were mounted for him, and he proposed to put them up on either side his fireplace.
The wall, above and for a few inches to the right and left of the mantelpiece, was bare of tapestry; the first-named place being occupied by the portrait, while the sides were four feet up the oaken wainscot which surrounded the whole room behind the tapestry, and from thence to the ceiling, plaster. The mantelpiece and fireplace were of a dark slaty stone, and of brick, respectively.
Archibald fixed upon what he considered the most effective positions for his heads--just above the level of the wainscot, and near enough to the mantelpiece not to be interfered with by the tapestry. He nailed up one of them on the left-hand side, the nails penetrating with just sufficient resistance in the firm plaster; and then, measuring carefully to the corresponding point on the right-hand side, he proceeded to affix the other head there. But the nail, on this occasion, could not be made to go in; and on his attempting to force it with a heavier stroke of the hammer, it bent beneath the blow, and the hammer came sharply into contact with the white surface of the wall, producing a clinking sound as from an impact on metal.
A brief investigation now revealed the fact that a circular disk of iron, about three inches in diameter, and painted white to match the plaster, was here let into the wall. What could be the object of it? With a fresh nail the boy began to scratch off the paint from the surface of the disk, in order to determine whether it were actually iron, or some other metal; in so doing a small movable lid, like the screen of a keyhole, was pushed aside, disclosing a little round aperture underneath. Archibald pushed the nail into it, thereby informing himself that the hole went straight into the wall, for a distance greater than the length of the nail; but how much greater, and what was at the end of it, he could only conjecture.
We must imagine him now standing upon a chair, with the nail in his hand, casting about in his mind for some means of probing this mysterious and unexpected hole to the bottom. At this juncture he happens to glance upward, and meets the intent regard