He knew not what to make of this, nor whether to be exalted or depressed; but, at all events, there seemed to be an accordance, a striking together, a mutual touch of their two natures, as if, somehow or other, they were performing the same part of solemn music; so that he felt his soul thrill, and at the same time shudder. Some sort of sympathy there surely was, but of what nature he could not tell; though often he was impelled to ask himself the same question he asked Sibyl, "Are we friends?" because of a sudden shock and repulsion that came between them, and passed away in a moment; and there would be Sibyl, smiling askance on him. And then he toiled away again at his chemical pursuits; tried to mingle things harmoniously that apparently were not born to be mingled; discovering a science for himself, and mixing it up with absurdities that other chemists had long ago flung aside; but still there would be that turbid aspect, still that lack of fragrance, still that want of the peculiar temperature, that was announced as the test of the matter. Over and over again he set the crystal vase in the sun, and let it stay there the appointed time, hoping that it would digest in such a manner as to bring about the desired result. One day, as it happened, his eyes fell upon the silver key which he had taken from the breast of the dead young man, and he thought within himself that this might have something to do with the seemingly unattainable success of his pursuit. He remembered, for the first time, the grim doctor's emphatic injunction to search for the little iron-bound box of which he had spoken, and which had come down with such legends attached to it; as, for instance, that it held the Devil's bond with his great-great-grandfather, now cancelled by the surrender of the latter's soul; that it held the golden key of Paradise; that it was full of old gold, or of the dry leaves of a hundred years ago; that it had a familiar fiend in it, who would be exorcised by the turning of the lock, but would otherwise remain a prisoner till the solid oak of the box mouldered, or the iron rusted away; so that between fear and the loss of the key, this curious old box had remained unopened, till itself was lost. But now Septimius, putting together what Aunt Keziah had said in her dying moments, and what Doctor Portsoaken had insisted upon, suddenly came to the conclusion that the possession of the old iron box might be of the greatest importance to him. So he set himself at once to think where he had last seen it. Aunt Keziah, of course, had put it away in some safe place or other, either in cellar or garret, no doubt; so Septimius, in the intervals of his other occupations, devoted several days to the search; and not to weary the reader with the particulars of the quest for an old box, suffice it to say that he at last found it, amongst various other antique rubbish, in a corner of the garret.