This is imperative if one is to give the right book to a child at the right time. Familiarity with the titles and with the outsides of the books is not enough, nor is it sufficient to know that a certain book is recommended in all of the best lists of children's books. A child will often refuse to take what has been recommended to him as a good book, when, if he be told some graphic incident in it, or have some interesting bit pointed out or read to him, he will bear it off as prize; with it, too, he will carry away an added respect for, and sense of comradeship with, the assistant, who "knows a good thing when she sees it," and he will come to her for advice and consultation about his books the next time and the next, and so long thereafter as she can hold his confidence. Carefully prepared lists are most valuable in directing your attention to the best books, but after your notice has been called to them read them, form your own judgment on them, and if you recommend them, at least know why. What? some one asks, attempt to read all of the best children's books? Yes, read them, and do more than that with some; the children's classics, the books which no child can grow up without reading and not be the poorer, with these one should be so familiar as to be able to quote from them or turn instantly to the most fascinating passages--they should form a constant part of her stock in trade. Other books one could not spend so much time on, nor is it necessary--the critical ability to go through a book quickly and catch the salient points in style, treatment and subject matter, is as essential for the children's librarian as for anyone who has to do with many books, and it therefore behooves her to cultivate what I once heard called the sixth sense, the book sense. (3) Knowledge of library methods. In any work, interest and enthusiasm go a great way, but they can never wholly take the place of accurate technical knowledge of the best ways of doing things. The more general knowledge of library work and methods one can bring to the children's department, the better it will be both for the work and for the worker; and given these methods, one must have ability to fit them to the conditions and to the peculiar needs to be accomplished, or, where they will not fit, to modify them or originate new ones which are better for the work in hand. (4) A thorough knowledge of the course of study of the public schools.