BOOKS AND BOOK MAKING.                     281

HE accompanying illustrations, upon this
page, represent the principal sizes of books,
namely: _Folio, a long book; Quarto (4to), nearly
square, ( shape of HILL'S MANUAL ); Octavo (8vo), the general
size ; and Duodecimo ( 12mo ), a small book,as seen below.
FOLIO.
The standard size of book paper is 25 x 38 inches; one half
of the sheet being 19 x 25 inches, which folded in two leaves,
having four pages, makes a book of the size called a folio.
QUARTO.
When the half sheet is folded in four leaves, making eight
pages, it forms a quarto in size.
OCTAVO.
The half sheet folded again, eight leaves, sixteen pages,
forms an octavo, or folded into sixteen leaves forms a sixteenmo.
DUODECIMO.
By folding the same into twelve leaves, making twenty-four
pages, we have a duodecimo. Folded into eighteen leaves, or
thirty-six pages, we form- an l8mo; into 24 leaves, and we have
a 24mo, &c.
The words Post, Crown, Demy, Royal, etc., used in connec-
tion, as Royal Octavo, designate the sizes of paper of which
books are made. See table, page 185.
Modern facilities for the manufacture of paper enable pub-
lishers to have any desired size made to order, as has been
done in the case of this book.

FOLIO.

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