with unfavorable home conditions. It seems probable that more may be done toward the prevention of delinquency through such social workers connected with the school system than by any other means. In many states there seems to be no definite system for the supervision of children for whom the state is responsible. They may be boarded or adopted by families or placed in institutions by any one of several local officials having jurisdiction, but none of them have the means of determining whether the children are being properly cared for, nor does the county or state provide any agency for this purpose. In several states the registration and supervision of such wards of the state is placed in the hands of a state child welfare board or a state department of charities or public welfare, but in other states the supervision of their welfare is wholly dependent upon private philanthropy. Experience has shown that where a trained social worker is employed to look up the relatives of such children and to assist in finding homes for them and in visiting the homes and institutions to which they are committed, a considerable saving in the cost of their maintenance to the county is frequently effected. In order that all of the care of children may be centralized under one county office which can employ competent persons for its work, several states have created county boards of child welfare which are charged with the whole responsibility for the care of dependent and neglected children, which is then taken entirely out of the hands of local officials. In a few states, county boards of public welfare have been created which have supervision not only of children but of all dependents, defectives, and neglected, and in some cases also have charge of the public health administration. The centralization of such authority in a county board which can employ executives who have had special training and experience for such work is not only good business, but it is the only method by which the state can satisfactorily fulfil its obligation to those who are dependent upon it.