Costly bindings.For the more magnificent classes of manuscripts, such as the Textus (Gospels) used as altar ornaments, every costly and elaborate artistic process was employed. In addition to the sumptuous gold and jewelled covers mentioned above at page [55], manuscripts were bound in plates of carved ivory set in gold frames, in plaques of Limoges enamel, especially the chamlevé enamels with the heads of the figures attached in relief, such as were produced with great skill at Limoges during the eleventh to the thirteenth century. Some Evangeliaria were bound in covers made of the ancient Roman or Byzantine ivory diptychs, a custom to which we owe the preservation of the most important existing examples of these.[[294]] Such costly methods of binding were of course exceptional, and most manuscripts were covered in a much simpler manner.

Common bindings.

Common bindings.The commonest form of binding was to make the covers of stout oak boards, which were covered with parchment, calf-skin, pig-skin or some other leather. Five brass or bronze bosses were fixed on each cover, arranged thus

and two or four stout clasps made of leather straps with brass catches were firmly nailed on to the oak. The angles of the covers were often strengthened by brass or latten cornerpieces, and in some cases metal edgings were nailed all along the edges of the oak, making a very strong, massive and heavy volume. Large pieces of rock crystal, amethyst or other common gem were frequently set in the five bosses of the covers. These were always cut in rounded form en cabochon, not faceted as is the modern custom.

The small amount of decoration, which was usually employed on early bindings, was often limited to tooled lines joining the five bosses on the covers[[295]].

Titles of MSS.

Titles of MSS.If the title of the manuscript was placed on the binding, a not very common practice, it was usually written on the upper part of one of the covers. In some cases the title was written on a separate slip of vellum and was protected by a transparent slice of horn, fixed with little brass nails.

This appears to have been the usual system as long as books were kept in coffers or armaria; but when open bookshelves with chained books came into use, about the time when printing was invented, the title of a book was usually written on the front edges of the leaves.

At that time books were set on the shelves in the opposite way to that now used, so that, not the back, but the edge of the volume was visible.