The third series consists of books for teachers, including great works of literature, history, and science, which will enrich the teacher's knowledge and contribute to a broader enthusiasm and culture. The writings of some of the great essayists, as Ruskin, Carlyle, Emerson, Kingsley, Motley, Lowell, Huxley, Macaulay, and others, are peculiarly fit to broaden the teacher's horizon and ennoble his purpose. Some of the best poems and novels suitable for advanced study are mentioned. There are also books which deal in a comprehensive and critical, but sympathetic, way with important literary topics, as the myths and great epics, the age of chivalry, and the lives of the most eminent writers. Some of the best works of biography and history are also suggested for teachers, and a number of the best professional and pedagogical books for teachers, dealing with literature, reading, and child study. 2. This list of books is of course tentative. There are other literary works as good, perhaps, but not a few difficulties stand in the way of the best selection. A few of the best materials are scattered in books not available for school purposes. Some of the finest of our longer classics have not been tested much in school use. There is, however, an abundance of choice English works, complete, well printed and bound, in cheap, schoolbook form. The chief difficulty, after all, is in selecting and arranging the best of an abundant and varied collection of excellent literature. This inspiring problem lies but partly solved at the threshold of every teacher's work. It requires extensive knowledge of literature and experience in its use in classes. A masterpiece may be read in several grades, and teachers will differ in judging its true place. Schools and classes differ also in their capacity and previous preparation for classic readings, so that no course of reading will fit all schools, or, perhaps, any two schools. Many principals will prefer to use the books one or two grades lower, or higher, than here indicated. Every teacher should use such a list according to his best individual judgment as based upon the needs of his school. This list was discussed and partly made out in conference with a number of experienced superintendents, and much variety of opinion was expressed as to the best grade for the use of a number of the selections.