There was another Chinese method, which, paradoxical as it may seem, was a combination of xylography and typography. It was invented A. D. 1041, by an ingenious Chinese blacksmith, named Pi-Ching, whose process is thus described by Davis. The inventor first made a thick paste of porcelain clay, and moulded or cut it in little oblong cubes of proper size. On these cubes he carved the Chinese characters that were most frequently used, thereby making movable types. The next process was to bake them in an oven until they were hardened. But the types so made were irregular as to height and as to body. In printers’ phrase, they would not stand together: some would be larger than the standard, others would be too high to paper, and all would be crooked. This difficulty could be remedied only by fixing the types firmly on a surface or bed-plate of unequal elevation. This surface was formed by pouring a melted mixture of wax, lime and [p113] resin on a plate of iron. Pi-Ching then took a stout frame of the size of the page he proposed to print, filled with iron wires in narrow parallels, and placed it on the prepared bed-plate. The types of clay were next forced between the iron wires on the mixture, and pressed close together. Then the plate was put on a furnace and heated until the composition became soft. A planer was put upon the face of the types, to force them down in the composition until they were firmly secured at a uniform height. So treated, the composed types were made as solid as a xylographic block or a stereotype plate. The form was then ready for printing. The method of printing was like that subsequently used for printing blocks engraved on wood, a method that will be described hereafter. When the form had been printed, heat was again applied; the types were withdrawn from the composition, cleaned of ink and adhering composition by the aid of a brush, and put back into a case for future use. Signs and unusual characters not in constant use were wrapped up in paper. There is nothing incredible in this curious story: on the contrary, it bears internal evidences of its probability. The selection, for printing purposes, of so unpromising a material as clay, the patient labor given to each character before it reached the condition of a type, the sagacity that foresaw and evaded the difficulty of irregular bodies and heights by the use of iron parallels, and a yielding bed-plate—all these are characteristic of the eccentricities of Chinese invention. The process was ingenious, but it was not entirely practical. It depended for its success more on the zeal and ability of Pi-Ching than it did on its own merits. When Pi-Ching died, his process died with him. His friends preserved his types as mementos of his ability, but none of them were able to use his method with success.