As our present inquiry relates to _Books_, it will not be expected to include anything concerning ancient methods of engraving inscriptions upon marbles, metals, or precious stones. Yet it should be remembered that a knowledge of inscriptions is often highly important, as furnishing subsidiary and independent means of determining the age of manuscripts, as indicated by the character of the writing. For as there are extant almost innumerable specimens of writing upon the more durable materials, and as these specimens belong to every age from the very earliest times, and as such inscriptions usually contain, either an explicit date, or some allusion to public persons or events, they serve to determine, beyond doubt, the successive changes that have taken place in the form of letters, and in the modes of writing. MATERIALS OF ANCIENT BOOKS. No material for books has, perhaps, a higher claim to antiquity than the skin of the calf or goat, tanned soft, and which usually was dyed red or yellow: the skins, when thus prepared, were most often connected in lengths, sometimes of a hundred feet, sufficient to contain an entire work; or one _book_ of a history or treatise, which then formed a roll, or _volume_. These soft skins seem to have been more in use among the Jews and other Asiatics than among the people of Europe. The copies of the Hebrew Scriptures, found in the synagogues of the Jews, are often of this kind: the most ancient manuscripts extant are some copies of the Pentateuch, on rolls of crimson leather. Parchment--Pergamena, so called long after the time of its first use, from Pergamus, a city of Mysia, where the manufacture was improved and carried on to a great extent, is mentioned by Herodotus and Ctesias, as a material which had been from time immemorial used for books. It has proved itself to be, of all others, except that above mentioned, the most durable. The greater part of all those manuscripts, now in our hands, that are of higher antiquity than the sixth century, are on parchment; as well as, generally, all carefully written, and curiously decorated manuscripts, of later times. The palimpsests, mentioned in a preceding chapter, are usually parchments. The practice, which is still followed in the East, of writing upon the leaves of trees, is of great antiquity. The leaves of the mallow, or of the palm, were those the most used for this purpose; sometimes they were wrought together so as to form larger surfaces; but it is probable that so fragile and inconvenient a material was employed rather for ordinary purposes of business, letter-writing, and the instruction of children, than for books, intended for preservation.