During the builders' excavation for Bucklersbury House, Walbrook, in the City of London, carried out in 1955, an immense clearance was made to a great depth in the natural soils underlying the man-made levels of London. Before this took place, scientific excavation in a limited area by Professor W. F. Grimes, on behalf of the Roman and Mediaeval London Excavation Council, had attracted a great deal of attention to the site, both from archaeologists and from the general public. His most spectacular discovery was the Temple of Mithras, which lay on the eastern edge of the site, adjoining the modern street of Walbrook. Almost of equal interest, however, to the student of Roman London, was his location of the Roman streambed of the Walbrook, which flowed in a southerly direction immediately to the west of the Temple of Mithras, about 30 yds. west of the street of Walbrook. The stream was subject to silting and its bed steadily rose, forming a thick deposit of black mud, which had an extraordinarily preservative effect on objects of metal which had been dropped in it from the banks. Iron was completely unrusted, while copper and bronze remained shining and bright.
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