Book excerpt: The London Stone at Staines marks the ancient western boundary of the jurisdiction of the City of London. The Lord Mayor and Corporation’s conservancy of the Thames extended east from there as far as Yantlet in Kent. This is the stretch of the river documented in 'Liquid History'. Drawing on the resources of English Heritage’s unrivalled photographic archives, the book records a journey along the length of the tidal river and over almost 150 years. We see the rural Thames as it approaches London, riverside towns, the civic and commercial development of the riverbanks, the working docks and warehouses, the development of the web of bridges that now links north and south, barges, sailing ships and warships, the great flood defences and a tiny beach that flourished briefly at the Tower of London. Featuring the work of pioneers of photography and some of the great topographical photographers of the 20th century, and with a fascinating commentary by Stephen Croad, 'Liquid History' chronicles the ebb and flow of the life of the river.