[Illustration: A Half-Sheet of Twenty-Fours, without Inset.] [Illustration: A Half-Sheet of Twenty-Fours, without Cutting.] [Illustration: A Half-Sheet of Thirty-Twos.] [Illustration: Outer Form of a Sheet of Thirty-Twos.] [Illustration: Outer Form of a Sheet of Thirty-Twos, with Four Signatures.] [Illustration: Inner Form of a Sheet of Thirty-Twos.] [Illustration: Inner Form of a Sheet of Thirty-Twos, with Four Signatures.] [Illustration: A Half-Sheet of Thirty-Twos, with Two Signatures.] [Illustration: A Half-Sheet of Thirty-Twos, 20 pages of the Work, 4 pages of Title, &c., and 8 of other Matter.] [Illustration: A Half-Sheet of Thirty-Sixes.] [Illustration: A Half-Sheet of Thirty-Sixes, without Cutting.] [Illustration: A Half-Sheet of Thirty-Sixes, with Two Signatures.] [Illustration: A Half-Sheet of Forties.] [Illustration: A Quarter-Sheet of Forty-Eights, with Two Signatures.] [Illustration: A Half-Sheet of Forty-Eights, with Two Signatures.] [Illustration: A Quarter-Sheet of Forty-Eights, without Cutting.] [Illustration: A Half-Sheet of Forty-Eights, with Three Signatures.] [Illustration: A Common Quarter-Sheet of Forty-Eights.] [Illustration: A Quarter-Sheet of Sixty-Fours, with Two Signatures.] [Illustration: A Common Quarter-Sheet of Sixty-Fours.] [Illustration: A Quarter-Sheet of Sixty-Fours, 20 pages of the Work, 8 of Title, and 4 of other Matter.] [Illustration: A Half-Sheet of Sixty-Fours.] [Illustration: A Half-Sheet of Seventy-Twos, with Three Signatures.] [Illustration: A Half-Sheet of Ninety-Sixes, with Six Signatures.] [Illustration: A Half-Sheet of One Hundred and Twenty-Eights, with Eight Signatures.] [Illustration] PROOF-READING AND CORRECTING. PROOF-READING. [Illustration] Undeniable as is the fact that a book marred by typographical errors and grammatical blemishes is a scandal to the profession, it must be admitted that a careful, steady, and competent reader is indispensable in every printing-office. It is eminently desirable that a reader should have been previously brought up a compositor. By a practical acquaintance with the mechanical departments of the business, he will be better able to detect those manifold errata which, unperceived by the man of mere learning and science, lie lurking, as it were, in a thousand different forms, in every sheet; and which, if overlooked, justly offend the taste and discernment of all appreciators of correct and beautiful typography.