Table No. I indicates that the migration has been going on for little longer than one year. Ninety-three percent of those who gave the time of residence in Pittsburgh had been here less than one year. More than eighty percent of the single men interviewed had been here less than six months. In the number who have been here for the longest periods, married men predominate, showing the tendency of this class to become permanent residents. This fact is evidently well known to some industrial concerns which have been bringing men from the South. Many of them have learned from bitter experience that the mere delivery of a train load of men from a Southern city, does not guarantee a sufficient supply of labor. This is evidenced by the fact that the labor agents of some of these firms, made an effort to secure married men only, and even to investigate them prior to their coming here. Differences in recruiting methods may also explain why some employers and labor agents hold a very optimistic view of the Negro as a worker, while others despair of him. The reason why Pittsburgh has been unable to secure a stable labor force is doubtless realized by the local manufacturers. The married Negro comes to the North to stay. He desires to have his family with him, and if he is not accompanied North by his wife and children he plans to have them follow him at the earliest possible date. Although such a man is glad to receive the better treatment, enlarged privileges and higher wages, which are accorded him here, he cannot adjust himself permanently to the Pittsburgh housing situation. He meets his first insuperable difficulty when he attempts to get a house in which to live. Back South, he may have been oppressed, but his home was often in a more comfortable place, where he had light and space. At least he did not have to live in one room in a congested slum and pay excessive rents.