We cannot too often remind ourselves of the fact that a circulating library is a distributing agency, and as such has points in common with other such agencies. The whole progress of civilization is dependent on distribution--the bringing to the individual of the thing he wants or needs. The library’s activities are, therefore, in the same class with commerce, and the tendency of modern changes in the library is to make the analogy closer and closer. To recognize this fact is by no means to degrade library work. All workers fall into the two great classes of producers and distributors. Civilization can get along without neither; we must have the farmer to grow the wheat and the railway to market it; we must have the author to write the book and the publisher and the bookseller and the librarian to place it in the hands of those who can use it. The librarian is not a producer; he takes the product of other people’s brains and distributes it; and his problem is how to do this most effectively. Do not misunderstand me. There have been some recent protests against treating the library as a commercial instead of an educational institution. The free library is not a commercial institution, but it _is_ an agency for distributing something, and there are also hundreds of other agencies for distributing other things. The objects and the methods of distribution are various, but certain laws apply to all kinds of distribution. Hence we may learn a good deal about library work by examining to see what it has in common with other kinds of distribution and in what respect it differs from them. Now, the prime factors in any kind of distribution are: 1, the products to be distributed; 2, the persons to whom they are to be distributed; 3, the distributors and methods of distribution. I know no better way of laying the basis of an efficient and successful distribution than the brief study, in order, of these three factors.