The area enclosed by the city walls was not larger than Hyde Park. Their course has been already traced, but we can follow them on the map of London by means of the names of the streets. Thus, beginning at the Tower, we pass on to Aldgate, and then to Bishopsgate. Outside was a protecting moat, which survives in the name Houndsditch, wherein doubtless dead dogs found a resting place. Then we pass on to London Wall, a street which sufficiently tells its derivation. Outside this part of the wall there was a fen, or bog, or moor, which survives in Moorfields, Moorgate Street, and possibly Finsbury; and Artillery Street shows where the makers of bows and arrows had their shops, near the artillery ground, where the users of these weapons practised at the butts. The name of the Barbican tells of a tower that guarded Aldersgate, and some remains of the wall can still be seen in Castle Street and in the churchyard of St. Giles', Cripplegate, the derivation of which has at length been satisfactorily determined by Mr. Loftie in our first chapter, and has nothing to do with the multitude of cripples which Stow imagined congregated there. Thence we go to Newgate and the Old Bailey, names that tell of walls and fortifications. Everyone knows the name of the Bailey court of a castle, which intervened between the keep or stronger portion of the defences and the outer walls or gate. The court of the Old Bailey suggests to modern prisoners other less pleasing ideas. Now the wall turns southward, in the direction of Ludgate, where it was protected by a stream called the Fleet, whence the name Fleet Street is derived. Canon Isaac Taylor suggests that Fleet Street is really Flood Street, from which Ludgate or Floodgate takes its name. We prefer the derivation given by Mr. Loftie. On the south of Ludgate, and on the bank of the Thames, stood a mighty strong castle, called Baynard Castle, constructed by William the Conqueror to aid him, with the Tower of London, to keep the citizens in order. It has entirely disappeared, but if you look closely at the map you will find a wharf which records its memory, and a ward of the city also is named after the long vanished stronghold. Now the course of the wall follows the north bank of the river Thames, and the names Dowgate and Billingsgate record its memory and of the city gates, which allowed peaceable citizens to enter, but were strong to resist foes and rebels. Within these walls craftsmen and traders had their own particular localities, the members of each trade working together side by side in their own street or district; and although now some of the trades have disappeared, and traders are no longer confined to one district, the street-names record the ancient home of their industries. The two great markets were the Eastcheap and Westcheap, now Cheapside. The former, in the days of Lydgate, was the abode of the butchers. Martin Lyckpenny sings: