The number of vagrant, vicious, and adventurous children around New York is so great, that a new institution for their correction and reformation springs up every few years, and though thousands are from these annually sent to the country, the buildings are always full, and the supply well nigh inexhaustible. For years past a class of large vicious boys have been thrown on the hands of the Commissioners of Charities and Corrections, for whom it has been difficult to well and suitably provide. If sent to the Workhouse or Penitentiary, they would he further steeped in evil, and if sent to the Nurseries, their insubordination incited the younger and more dutiful to mischief and demoralization. Hence, after the purchase of Hart Island, which occurred in May, 1868, they were placed there in the capacity of an Industrial School. On this Island the Potter's Field has been located, separate sections having been set apart for Catholic and Protestant burial. The southern portion, during the spring and early summer of 1870, was also set apart for the treatment of persons suffering with relapsing fever. The Island contained at the time of its purchase more than sixty buildings of wood, constructed by the United States Government for the use of the soldiers, and said to have cost over $200,000. The dilapidated buildings were pulled down and the sound material employed in repairing other buildings. Those formerly occupied by the officers of the army and navy of the barracks were excellent structures of their kind, and were easily converted to the uses for which they were desired. The buildings formerly occupied by the officers are now the residences of the warden, matron, teachers, surgeon, clerks, etc. Others have been changed to school-rooms, dormitories, play-rooms, dining-rooms, and two houses for baking and cooking. A large ice-house has been erected, capable of containing a hundred tons of that invaluable antidote to midsummer heats. The school began late in the year 1868, and on the 31st of December, 1869, the warden reported the reception of 504 boys. The utter neglect under which they had thus far grown up appears in the fact that seventy-five per cent. of them could neither read nor write, fifteen per cent. able to read only, leaving but ten per cent. in tolerable possession of the rudiments of an education. They are kept in school five hours per day, devoting the remainder to play or light labor. A vigorous system of discipline has been introduced, but no very serious corporal punishment is inflicted. During the last year, 972 boys were received into the school.