The dread of advancing cholera, with the guilty knowledge of the harvest field that awaited the plague in New York's slums, pricked the conscience of the community into action soon after the close of the war. A citizens' movement resulted in the organization of a Board of Health and the adoption of the "Tenement-House Act" of 1867, the first step toward remedial legislation. A thorough canvass of the tenements had been begun already in the previous year; but the cholera first, and next a scourge of small-pox, delayed the work, while emphasizing the need of it, so that it was 1869 before it got fairly under way and began to tell. The dark bedroom fell under the ban first. In that year the Board ordered the cutting of more than forty-six thousand windows in interior rooms, chiefly for ventilation--for little or no light was to be had from the dark hallways. Air-shafts were unknown. The saw had a job all that summer; by early fall nearly all the orders had been carried out. Not without opposition; obstacles were thrown in the way of the officials on the one side by the owners of the tenements, who saw in every order to repair or clean up only an item of added expense to diminish their income from the rent; on the other side by the tenants themselves, who had sunk, after a generation of unavailing protest, to the level of their surroundings, and were at last content to remain there. The tenements had bred their Nemesis, a proletariat ready and able to avenge the wrongs of their crowds. Already it taxed the city heavily for the support of its jails and charities. The basis of opposition, curiously enough, was the same at both extremes; owner and tenant alike considered official interference an infringement of personal rights, and a hardship. It took long years of weary labor to make good the claim of the sunlight to such corners of the dens as it could reach at all. Not until five years after did the department succeed at last in ousting the "cave-dwellers" and closing some five hundred and fifty cellars south of Houston Street, many of them below tide-water, that had been used as living apartments. In many instances the police had to drag the tenants out by force.