It was a fine room, not too large, and yet of sufficient size to seat an audience. The object was to afford a concert-room for dramatic and theatrical performances, and also for balls. As the site was valuable, and every particle of space had to be utilised in the centre of this mighty city, it had been built over vaults, which were intended for bonded warehouses; but partly on account of the high rent asked, and partly because of the dampness of the cellars—the site was the very centre of the old Swamp—had never been occupied. The access was bad, and there was no place for a display or advertisement, which was another reason why the cellars had not let. There was a certain amount of propriety in holding what was to be called “The Grand Centennial Family Council” in this hall, built upon the centre of the ancient Swamp, and named after the founder of the city. Marese and Theodore, in disguise, examined the vaults, under the pretence of being agents for London merchants desirous of opening business in Stirmingham. There was hardly any necessity for this precaution, for it was so many years since they had openly resided in the place that few would have recognised them. To their great surprise, these vaults, whose gloomy darkness they explored by the light of lanterns, extended in one vast cavern, under the whole of the hall. Instead of a series of cellars, there was one huge cavern. This was occasioned by the flooring not being supported upon brick arches, as would have been architecturally preferable, but upon timber posts, or pillars. The place had, in fact, been put up hastily, and the vaults were never completed. The timber pillars were placed in regular order, and it had been intended to build brick partitions; but as no one seemed to care to occupy the cellars, this had never been done. The floor was extremely damp, and the whole appearance of the place repulsive. Snails, toads, and slimy reptiles crawled about, and this under the very stage above, upon which music, song, and dance were wont to enliven the gay hearts of the audiences. One great obstacle to the idea of blowing up the place was the height of these timber posts, which was full eighteen feet, so that the roof of the vault was high over head, and any explosives, to produce the full effect, would have to be piled up on casks or stands. Then the hall was larger than they had supposed, and it was apparent that the coming council would occupy but a portion of it, and perhaps change that portion now and then, so that it would be uncertain where to place the nitro-glycerine.