“The model of a block of tenements which is shown in the heading of this article . . . fairly presents New York’s problem. The block is the one that is bounded by Canal, Forsyth, Bayard, and Chrystie streets. It covers 80,000 square feet, and in 1896 it sheltered 2388 human beings. It is safe to say that its population to-day is not under 2500. In its gloom and its crowds it is typical of all the rest on that East Side, where the population is jammed as nowhere else in the world.