"The third story contains, within oval panels, miners at work picking the coal, &c.: flowers and small landscapes add to the richness and variety of the decorations on this floor; and both in this and the lower, calamites (fossils from the coal formations) are depicted in the arabesques. The twenty-four panels at the springing of the dome, of which we have before spoken, have oval compartments painted in them, surrounded by a gracefully-flowing border of extremely rich and varied design, being light ornaments on a dark ground. The spaces within the oval borders are coloured of a turquoise blue tint, on which is painted a series of representations of different fossil plants met with in the coal formations. This portion of the decoration is extremely striking and appropriate; and we need scarcely say, the representations of the plants are strictly correct. "Ere we leave the pictorial portion of the Exchange, we must not forget the groups of mining implements, most skilfully treated, in the narrow panels in the dome over the piers. "The whole of the artistic embellishments of the building were designed by Mr. Sang, whose taste and skill in such works is well known, and executed under his immediate directions; and it may be considered a most successful specimen of the Raffaelesque style of ornamentation, now so extensively adopted in the mansions of the nobility. "For originality of design, this building is the most striking which has been erected in London for a long time past, and reflects the very highest credit on the talented architect, J. B. Bunning, Esq. "Mr. William Trego was the builder; and the iron-work was executed by Messrs. Dewer of Old-street." While digging for the foundation of the Coal Exchange, a Roman hypocaust was brought to light, which has since been arched over and preserved--another addition to the many Roman remains which have been discovered in the neighbourhood of Upper and Lower Thames-street. Before quitting this part of the neighbourhood, we must state that the Custom-House stands close by the places we have just described; and as this is the last object in Lower Thames-street that requires notice, we will briefly glance at it, and then ascend to the higher streets.