M. Léon de Laborde, one of the clearest and best informed writers on the origins of engraving and typography, considers, on the other hand, that engraving in relief on metal, rather than the xylographic process, was the proximate cause of the discovery of printing. In a work published in 1839, which unfortunately has yet to receive the amplifications promised by the author,[12] M. de Laborde declares that the first printed engravings must have been dotted ones: that is, prints produced in the peculiar mode already touched upon, and in which the black parts come out sprinkled with white dots. According to him, engraving, or, to speak more exactly, the printing of engraved work, must have been invented by goldsmiths rather than by draughtsmen or illuminators. The former, by the nature of their craft, possessed the tools and the necessary materials, and were therefore in a better position than any one else to stumble upon the discovery of the process, if not deliberately to invent it. As matter of fact, many of those who worked in the Low Countries, or in the Rhenish provinces, during the first years of the fifteenth century, printed works in the early dot manner: in other words, engraved in relief on metal. And those xylographic specimens which are usually looked upon as the oldest examples of engraving, are in reality only the outcome of a reformation, and the product of an art already modified. [Illustration: FIG. 9.--JESUS CHRIST CARRYING THE CROSS. Engraving in the Dot Manner (1406).] The opinion expressed some time ago by M. Léon de Laborde has recently been supported by the discovery of two engravings, in the early dot manner, belonging, we think, to the year 1406, and on which we have ourselves published some remarks.[13] But our argument being only founded on the similarity of certain external facts, so to speak, and on the probability of certain calculations, it is not really possible to attribute to these documents so secure a standing as to those whose age is established by dates, and set practically beyond question. [Illustration: FIG. 10.--THE HOLY FACE. Engraving in the Dot Manner (1406).]