The author has studied and compared a considerable number of works by the best authorities on the subject and has endeavored to adapt the best of their contents to the use of printers' apprentices.Every author has his own set of rules. At first sight, each set appears inconsistent with those given by other writers. This inconsistency, however, is generally more apparent than real. It arises from differences in point of view, method of approach, and system of classification. An attempt has been made to compile from these sources a set of rules which would bring before the pupil a correct and comprehensive view of the best current usage, well illustrated by examples and accompanied by practical typographical hints. The fact has been kept steadily in mind that this book is intended for a certain definite class of pupils and no pains have been spared to fit it to their needs. Any treatise consisting, as this one necessarily does, mainly of rules is practically useful only as a basis for constant and persistent drill. It is, of course, valuable for reference, but the emergencies of the day's work leave no time for consultation. These rules must be learned, and not only learned but assimilated so that their correct application becomes instinctive and instantaneous. This result can be secured only by practice. Hence the emphasis laid on the exercises indicated in the paragraphs introductory to the review questions.