_b. Notes._ These consist of explanatory notes, that are placed wherever they seem to be needed. They explain words not usually found readily in the dictionaries, foreign phrases, and such historical or other allusions as are necessary to an understanding of the text by youthful readers. These notes are placed at the bottom of the page that needs explanation, and so are immediately available. In such a position they are more liable to be read than if gathered together at the end of the volume. They are neither formal nor pedantic, and are as brief as is consistent with clearness. Their purpose is to help the reader, not to show the writer's knowledge. _c. Introductory Notes._ At the heads of selections from longer masterpieces are introductory notes which give some little account of the larger work and enough of the context so that the selection may not seem a fragment. In some instances this note gives the historical setting of a masterpiece or tells something of the circumstances under which it was written, when those facts help to an appreciation of the selection. Sometimes an acquaintance with the personality of an author is so necessary to a clear understanding of what he writes that a brief sketch of his life or a few anecdotes that show his character are given in the note preceding what he has written. These notes are printed in the same type as the text, especially in the first four volumes, for they are felt to be worthy of equal consideration. _d. Biographies._ Besides the biographical notes appended to selections, there are not a few more pretentious sketches that have been given prominent titles in the body of the books. These have been prepared expressly for this work, either by the editor or by some one fully acquainted with the subject and accustomed to writing for young people. These biographies are written from the point of view of young people, and contain the things that boys and girls like to know about their favorite authors or some of the noble men and women whose lives have made this world a better and a happier place in which to live. In the earlier volumes they are brief, simple, and largely made up of anecdotes; later they are more mature, and show something of the reasons that make the lives interesting and valuable material for studies. There are, also, in the books a few lengthy extracts from some of the world's great biographies. Care has been exercised in the selection of these, so that in each case, while the extract is of interest to young people, it is also fairly representative of the larger work from which it has been taken.