In the fourteenth century Petrarch was knocked down by one of his own tomes, and was within an ace of breaking his leg, but this was at a period when monastic bindings ordinarily consisted of wood, covered with leather and protected by metallic bosses, corner plates, and massive clasps of iron. Bulk and weight were then the great desiderata, though every now and then the richest materials were still employed in binding, as when a king's library was added to, or some rich monastery gave orders for a sacred volume to be covered with the enamels of Limoges, ivory, gold or silver, and encrusted with jewels.
From the end of the fifth to the middle of the fifteenth century, books were excessively rare and costly, and comparatively few bindings illustrative of the art during the dark ages have been preserved. The few that have survived are wonderful specimens of art, and in every way worthy of the illuminated manuscripts they enclose.
The period of the Renaissance, which is usually assigned to the Pontificate of Leo X., was witness of another change. The ponderous tomes, whose weight was alone a protection, gradually gave way to smaller-sized volumes, and these were often bound in velvet or silk, beautifully embroidered by lady amateurs, perhaps also by professed binders. At other times the monastic covering of wood and leather is observable, and often the leather gave way to seal and shark skin without any tooling or other ornamentation.
These different styles of binding continued in vogue side by side until the introduction of typography, when the Venetians introduced morocco from the East and found out the virtues of calf. Books now became bound in oak boards covered with these leathers or in thick parchment or pig skin, old manuscripts often being cut up and of course destroyed for the purpose: boards, clasps, and bosses became obsolete, while silken embroidery maintained a precarious existence, dependent solely on the spasmodic efforts of accomplished amateurs whose tastes and inclinations were swayed by fashion. Finally, parchment disappeared and leather bindings held universal sway, and have so maintained it to our own time, though the English cloth-bound book is now employed whenever expense is an object.