Illustrated Science for Boys and Girls

Up over our heads, in the room of the type-setters, are a hundred columns, or more, of articles already set--enough to make two or three newspapers. The Foreman of the type-setters makes copies of these on narrow strips of paper with a hand-press, and sends them down to the Editor-in-Chief. These copies on narrow strips of paper, are called "proofs," because, when they are read over, the person reading them can see if the type has been set correctly--can prove the correctness or incorrectness of the type-setting.

[Illustration: TAKING "PROOFS."]

The Editor-in-Chief runs rapidly through these proofs, and marks, against here and there one, "Must," which means that it "must" be published in to-morrow's paper. Against other articles he marks, "Desirable," which means that the articles are "desirable" to be used, if there is room for them. Many of the articles he makes no mark against, because they can wait, perhaps a week, or a month. By ha