The children's department in a large library should contain at least two large rooms, one for the reading and reference room, the other for the circulating books. The rooms should be light, bright and cheery, as daintily artistic and as immaculately clean as it is possible to make and keep them. Wall cases seem best for the shelving of the books, low enough for the children to reach the shelves easily. These low cases also allow wall space above for pictures, and plenty of this is desirable. A children's room cannot have too many pictures,[1] nor any which are too fine for it; choose for it pictures which are fine, and pictures which "tell a story." Provide, also, plenty of space for bulletins, for the picture bulletins have become an important factor in the direction of the children's reading. One enthusiastic children's librarian wrote me recently that her new "burlap walls, admitting any number of thumb-tacks" were the delight of her heart. There should be reading tables and rubber- tipped chairs, low ones for the little children; and wherever there is space for them, the long, low seats, in which children delight to snuggle down so comfortably. [1] If this paper were now open to revision, the writer would omit "cannot have too many pictures." The reaction against bare, bleak walls may not make it necessary to warn against over-decoration, but its undesirability should he recognized.--L. A. E. As to the arrangement of the books, I should divide them into three distinct classes for children of different ages: (1) The picture books for the very little ones, arranged alphabetically. (2) The books for children from seven to ten or twelve years of age. While these books should be classified for the cataloging, I should place them on the shelves in one simple alphabetical list by authors, mixing the fiction, history, travel, poetry, etc., just as they might happen to come in this arrangement. I believe this would lead the children to a more varied choice in their reading, and that they would thus read and enjoy biography, history, natural science, etc., before they learned to distinguish them from stories, whereas by the classified arrangement they would choose their reading much more often from the one class only. (3) The books for boys and girls from ten or twelve years of age to fifteen or sixteen. These should be arranged on the shelves regularly according to class number, in order that the children may become acquainted with the classification and arrangement, learn to select their books intelligently, and be prepared to graduate from here into the adult library. Where it is possible to duplicate the simple and more common reference books in the juvenile department, these should form a fourth class. Then there should be all of the good juvenile periodicals, with some of the best illustrated papers, such as Harper's weekly, for the reading room.