This Association, during nearly twenty years, has removed to country homes and employment about twenty-five thousand persons, the greater part of whom have been poor and homeless children; it has founded, and still supports, five Lodging-houses for homeless and street-wandering boys and girls, five free Reading-rooms for boys and young men, and twenty Industrial Schools for children too poor, ragged, and undisciplined for the Public Schools. We have always been confident that time would show, even in the statistics of crime in our 19 prisons and police courts, the fruits of these very extended and earnest labors. It required several years to properly found and organize the Children's Aid Society, and then it must be some ten years-when the children acted upon in all its various branches have come to young manhood and womanhood--before the true effects are to be seen. We would not, however, exclude, as causes of whatever results may be traced, all similar movements in behalf of the youthful criminal classes. We may then fairly look, in the present and the past few years, for the effects on crime and pauperism of these widely-extended charities in behalf of children. CRIME CHECKED. The most important field of the Children's Aid Society has been among the destitute and street-wandering and tempted little girls, its labors embracing many thousands annually of this unfortunate class. Has crime increased with them? The great offense of this class, either as children or as young women, comes under the heading of "Vagrancy"-this including their arrest and punishment, either as street-walkers, or prostitutes, or homeless persons. In this there is, during the past thirteen years, a most remarkable decrease--a diminution of crime probably unexampled in any criminal records through the world. The rate in the commitments to the city prisons, as appears in the reports of the Board of Charities and Correction, runs thus:-- Of female vagrants, there were in 1857..........3,449 1859..........5,778 1860..........5,880 1861..........3,172 1862..........2,243 1863..........1,756 1864..........1,342 1869............785 1870............671 1871............548. We have omitted some of the years on account of want of space; they do not, however, change the steady rate of decrease in this offense.