7. Some books are named twice in the lists, first as books of reference, or in the teacher's lists, and in a later grade for the use of children in regular reading. We have been especially careful in selecting appropriate books in the first list for each grade adapted to the age of the children. These books for regular reading must be used by every child, so that they should be fitted to the average ability. The reference books for collateral reading in the second series of each grade may be more difficult in some cases, as they will be used, in part, only by the stronger pupils. There are certain groups of kindred books, like the Greek myths, that are distributed through three or more grades. It is not expected that any child will use all of these books, as several of them may deal with the same story, like the "Iliad" or "Odyssey." It seemed best to include all the important renderings of these stories, and leave the teacher to choose among them for his class. 8. To give more specific aid to teachers, most of the books are briefly described, and some notion of their special worth and fitness indicated. It is hoped that these short descriptions will be of considerable help to young teachers in making selections for their classes. 9. Many of the best and most commonly used books are published by several companies. In such cases the names of the different publishers are indicated in connection with each book. 10. By an examination of these lists the teacher of any grade will discover that, in order to teach well, she must be acquainted with the books used in one or two grades, both above and below her own. All the chief groups of books in literature run through three or four grades, and the teacher in any grade needs to get a comprehensive view of the important groups of books used in her classes. In addition to this, the books recommended for teachers give a still more definite and comprehensive grasp of large classes of literary material. The books recommended for teachers could be indefinitely extended, but it is hoped that enough are mentioned to give definiteness to their wider studies, and to serve as an introduction to some of the larger fields of literature, science, and history.