Let us now ascend the estuary of the Humber, and, proceeding up its numerous tributaries, seek out various places of interest in the West Riding of Yorkshire. And first, ascending the river Don, we come to that great manufacturing centre of the "Black Country," sacred to coal and iron, Sheffield. Murray's _Guide_ tells us that while Sheffield is one of the largest and most important towns in Yorkshire, it is "beyond all question the blackest, dirtiest, and least respectable." Horace Walpole in the last century wrote that Sheffield is "one of the foulest towns in England in the most charming situation." It is a crowded city, with narrow and badly-arranged streets, having few handsome public buildings, but bristling with countless tall chimneys belching forth clouds of heavy smoke that hang like a pall over the place. The Don and its tributaries have their beds defiled, and altogether the smoky city is in unpleasant contrast with the beauty of the surrounding country. But, unfortunately, an omelette cannot be made without breaking eggs, nor can Sheffield make cutlery without smoke and bad odors, all of which have amazingly multiplied within the present century, its population having grown from forty-five thousand in 1801 to over three hundred thousand now. It stands at the confluence of the rivers Don and Sheaf, its name being connected with the latter. Three smaller streams join them within the city and are utilized for water-power. The factories spread over the lowlands of the Don valley, and mount up its western slopes towards the moorlands that stretch away to Derbyshire; it is therefore as hilly as it is grimy. Sheffield at the time of the Norman Conquest was the manor of Hallam, which has passed through various families, until, in the seventeenth century, it became by marriage the property of the Duke of Norfolk. The present duke is lord of the manor of Sheffield, and derives a large income from his vast estates there. Sheffield Castle once stood at the confluence of the two rivers, but all traces of it have disappeared. The manor-house, which has been restored, dates from the time of Henry VIII. It is three stories high, and a turret staircase leads from floor to floor, and finally out upon the flat roof. [Illustration: ENTRANCE TO THE CUTLERS' HALL.]