When they come at last to Tom-all-Alone’s, Mr. Bucket stops for a moment at the corner and takes a lighted bull’s-eye from the constable on duty there, who then accompanies him with his own particular bull’s-eye at his waist.  Between his two conductors, Mr. Snagsby passes along the middle of a villainous street, undrained, unventilated, deep in black mud and corrupt water—­ though the roads are dry elsewhere—­and reeking with such smells and sights that he, who has lived in London all his life, can scarce believe his senses.  Branching from this street and its heaps of ruins are other streets and courts so infamous that Mr. Snagsby sickens in body and mind and feels as if he were going every moment deeper down into the infernal gulf.

“Draw off a bit here, Mr. Snagsby,” says Bucket as a kind of shabby palanquin is borne towards them, surrounded by a noisy crowd.  “Here’s the fever coming up the street!”

As the unseen wretch goes by, the crowd, leaving that object of attraction, hovers round the three visitors like a dream of horrible faces and fades away up alleys and into ruins and behind walls, and with occasional cries and shrill whistles of warning, thenceforth flits about them until they leave the place.

“Are those the fever-houses, Darby?” Mr. Bucket coolly asks as he turns his bull’s-eye on a line of stinking ruins.

Darby replies that “all them are,” and further that in all, for months and months, the people “have been down by dozens” and have been carried out dead and dying “like sheep with the rot.”  Bucket observing to Mr. Snagsby as they go on again that he looks a little poorly, Mr. Snagsby answers that he feels as if he couldn’t breathe the dreadful air.

There is inquiry made at various houses for a boy named Jo.  As few people are known in Tom-all-Alone’s by any Christian sign, there is much reference to Mr. Snagsby whether he means Carrots, or the Colonel, or Gallows, or Young Chisel, or Terrier Tip, or Lanky, or the Brick.  Mr. Snagsby describes over and over again.  There are conflicting opinions respecting the original of his picture.  Some think it must be Carrots, some say the Brick.  The Colonel is produced, but is not at all near the thing.  Whenever Mr. Snagsby and his conductors are stationary, the crowd flows round, and from its squalid depths obsequious advice heaves up to Mr. Bucket.  Whenever they move, and the angry bull’s-eyes glare, it fades away and flits about them up the alleys, and in the ruins, and behind the walls, as before.

At last there is a lair found out where Toughy, or the Tough Subject, lays him down at night; and it is thought that the Tough Subject may be Jo.  Comparison of notes between Mr. Snagsby and the proprietress of the house—­a drunken face tied up in a black bundle, and flaring out of a heap of rags on the floor of a dog-hutch which is her private apartment—­leads to the establishment of this conclusion.  Toughy has gone to the doctor’s to get a bottle of stuff for a sick woman but will be here anon.