What will be the future distribution of libraries in this country? At present their numbers are large in the northern states and comparatively small in the southern. Growth has been unexampled in its rapidity and has been stimulated by large benefactions. So far as this growth may be looked upon as the direct result of Mr. Carnegie’s gifts it may doubtless be regarded as abnormal, although it should be noted that every Carnegie building means a present and future outlay on the part of the community in which it stands, of many times the amount given by the donor. Primarily, library expansion is the result of a popular conviction that the public library is a public necessity. Expansion has proceeded in proportion to the spread of that conviction and along the lines of its progress. If there are fewer public libraries in the South than in the North it is because the need for them is not felt there, even if it exists. Doubtless the race problem is a powerful inhibitory influence. Two things are certain; that library expansion is to go on for some time, and that a time will come when it must stop. When that time arrives, the library will have attained its majority and we shall have an opportunity to address ourselves to problems that can not be attended to during our period of growth. Who will use our great library of the future? Who uses the library of to-day? I have been asked that question by reporters and have been puzzled to answer it. For whose use is the public library intended? It will be logical to answer “the Public, of course,” but there are a great many people who will give this answer with mental reservations. With them “the Public” means some particular part of the public. Some think that the libraries are for the poor, or at any rate for those who cannot afford to buy books for themselves. This is a survival of the origin of some of our circulating libraries, which were originally charities. But a public foundation and a charitable foundation are two different things. Our parks are free, yet we do not object to their free use by the wealthy, nor do the wealthy classes themselves seem to shrink from it. Some again would limit the use of a library to students, or at all events to those who do not care to withdraw books for home use. These are people who do not believe in the circulating library--and there are still such. Others again would have the public library cater only to those of educated literary taste. For these reasons and for others it is a fact that our public libraries, even those with the largest circulations, are not used by the entire public. Probably, however, they are being used more and more freely. In a library that uses the two-book system it is impossible to tell exactly from statistics, how many persons are drawing from the library at one time. Assuming, however, that the number is proportional to the number of books outstanding, we find in the New York Public Library that it has been increasing a little