Slowly, with many setbacks, we battled our way into the light. A Board of Health had come with the cholera panic in 1866. The swine that ran at large in the streets, practically the only scavengers, were banished. The cholera and the yellow fever that had ravaged the city by turns never came back. The smallpox went its way, too,[10] and was heard of again only once as an epidemic, till people had forgotten what it was like,--enough to make them listen to the anti-vaccination cranks,--and politics had the health department by the throat again and held the gate open. We acquired tenement house laws, and the process of education that had begun with the foraging ground of the swine was extended step by step to the citizen's home. Short steps and cautious were they. Every obstacle which the landlord's cunning and the perversion of the machinery of the law to serve his interests could devise was thrown in the way. It was a new doctrine to that day that any power should intervene between him and the tenants who represented his income, and it was held to be a hardship if not downright robbery. The builder took the same view. Every tenement house plan was the subject of hot debate between the Health Board and the builder, or his architect. The smallest air-shaft had to be wrung out of him, as it were, by main strength. The church itself was too often on the side of the enemy, where its material interests were involved. Trinity, the wealthiest church corporation in the land, was in constant opposition as a tenement house landlord, and finally, to save a few hundred dollars, came near upsetting the whole structure of tenement law that had been built up in the interest of the toilers and of the city's safety with such infinite pains. The courts were reluctant. Courts in such matters record rather than lead the state of the public mind, and now that the immediate danger of an epidemic was over, the public mind had a hard time grasping the fact that bettering the housing of the poor was simple protection for the community. When suit was brought against a bad landlord, judges demanded that the department must prove not only that a certain state of soil saturation, for instance, was dangerous to health, but that some one had been actually made sick by that specified nuisance. Fat-boilers, slaughter-house men, and keepers of other nuisances made common cause against the new decency, and with these obstacles in front, the Sanitarians found the enemy constantly recruited from the rear. With the immense immigration that poured in after the Civil War, the evil with which they were struggling grew enormously. Economic problems other than the old one of rent came to vex us. The sweater moved into the East Side tenements. Child-labor grew and swelled.