Each great modern city hath its inferno.

Here dwell costermongers, rag-pickers and street-cleaners; here the sweater hath his haunts.

Huge rookeries and tenements, whose every brick exudes filth, teem with miserable folk.

Each room has one or more families, from the second cellar at the bottom to the garret at the top.

No greensward, no park, no blade of grass.