The original site of London was a vast marsh, extending from where Fulham stands to-day to Greenwich, a distance of nine or ten miles, with a breadth in places of two or two and a half miles. The uplands beyond the Thames marshes were covered with dense forests in which the bear, the wild boar, and the wild ox roamed at will. Essex was almost entirely forest down to the date of the conquest. Nearly the whole expanse of what to-day is Sussex, and, also, considerable portions of Kent and Hampshire, were covered by a wood--the Andred-Weald, or Andreswald--which in King Alfred's time is said by the Anglo-Saxon Chronicle to have been 120 miles long and 30 miles broad. Here it was that, until even these great supplies were approaching exhaustion, the iron industry established in Sussex in the thirteenth century obtained the wood and the charcoal which were exclusively used as fuel in iron-making until the second half of the eighteenth century, when coal and coke began to be generally substituted. Wilts, Dorset and other southern counties had extensive woodlands which were more or less depleted under like conditions. Warwickshire, Northamptonshire and Leicestershire all had extensive woods. Sherwood Forest extended over almost the whole of Nottinghamshire. In Derbyshire, as shown by the Domesday Survey, five hundreds {5}out of six were heavily wooded, and nineteen manors out of twenty-three had wood on them. "In Lancashire," says Charles Pearson, in the notes to his "Historical Maps of England During the First Thirteen Centuries," "if we distinguish forest from wood, and assume that the former was only wilderness, we still have official evidence for believing that a quarter of a million acres of the land between Mersey and Ribble was covered with a network of separate dense woods." Altogether, it is calculated by various authorities that in the earliest days of our history about one third of the surface of the soil in the British Isles was covered with wood, thicket, or scrub. Of the remainder a very large proportion was fen-land, marsh-land or heath-land. "From the sea-board of Suffolk and Norfolk," says the Rev. W. Denton, in "England in the Fifteenth Century," "and on the north coast almost to the limits of the great level, stretched a series of swamps, quagmires, small lakes and 'broads.'" A great fen, 60 miles in length and 40 miles in breadth, covered a large proportion of the counties of Cambridgeshire, Huntingdonshire, Northamptonshire, Lincolnshire, Norfolk and Suffolk. A great part of Lancashire, Mr Denton further states, was a region of marshes and quaking mosses, while "from Norwich to Liverpool, and from the mouth of the Ouse at Lynn to the Mersey, where it falls into the Irish sea, a line of fen, uncultivated moors and morasses stretched across England and separated the northern counties from the midland districts, the old territory of Mercia."