There is some probability that this art originated in China, where it was practised long before it was known in Europe. Some European traveller might have imported the hint.[30] That the Romans did not practise the art of printing cannot but excite our astonishment, since they actually used it, unconscious of their rich possession. I have seen Roman stereotypes, or immoveable printing types, with which they stamped their pottery.[31] How in daily practising the art, though confined to this object, it did not occur to so ingenious a people to print their literary works, is not easily to be accounted for. Did the wise and grave senate dread those inconveniences which attend its indiscriminate use? Or perhaps they did not care to deprive so large a body of scribes of their business. Not a hint of the art itself appears in their writings. When first the art of printing was discovered, they only made use of one side of a leaf; they had not yet found out the expedient of impressing the other. Afterwards they thought of pasting the blank sides, which made them appear like one leaf. Their blocks were made of soft woods, and their letters were carved; but frequently breaking, the expense and trouble of carving and gluing new letters suggested our moveable types which, have produced an almost miraculous celerity in this art. The modern stereotype, consisting of entire pages in solid blocks of metal, and, not being liable to break like the soft wood at first used, has been profitably employed for works which require to be frequently reprinted. Printing in carved blocks of wood must have greatly retarded the progress of universal knowledge: for one set of types could only have produced one work, whereas it now serves for hundreds. When their editions were intended to be curious, they omitted to print the initial letter of a chapter: they left that blank space to be painted or illuminated, to the fancy of the purchaser. Several ancient volumes of these early times have been found where these letters are wanting, as they neglected to have them painted. The initial carved letter, which is generally a fine wood-cut, among our printed books, is evidently a remains or imitation of these ornaments.[32] Among the very earliest books printed, which were religious, the Poor Man's Bible has wooden cuts in a coarse style, without the least shadowing or crossing of strokes, and these they inelegantly daubed over with broad colours, which they termed illuminating, and sold at a cheap rate to those who could not afford to purchase costly missals elegantly written and painted on vellum. Specimens of these rude efforts of illuminated prints may be seen in Strutt's Dictionary of Engravers. The Bodleian library possesses the originals.[33]