books. There was an urgent public need for notices, proclamations, and the like. Yet there is nothing in the history of the Western civilizations that one can call printing until the fifteenth century A.D. It is not as though printing was a recondite art or dependent upon any precedent and preliminary discoveries. Printing is the most obvious of dodges. In principle it has always been known. As we have already stated, there is ground for supposing that the Palæolithic men of the Magdalenian period may have printed designs on their leather garments. The "seals" of ancient Sumeria again were printing devices. Coins are print. Illiterate persons in all ages have used wooden or metal stamps for their signatures; William I, the Norman Conqueror of England, for example, used such a stamp with ink to sign documents. In China the classics were being printed by the second century A.D. Yet either because of a complex of small difficulties about ink or papyrus or the form of books, or because of some protective resistance on the part of the owners of the slave copyists, or because the script was too swift and easy to set men thinking how to write it still more easily, as the Chinese character or the Gothic letters did, or because of a gap in the social system between men of thought and knowledge and men of technical skill, printing was not used—not even used for the exact reproduction of illustrations.
The chief reason for this failure to develop printing systematically lies, no doubt, in the fact that there was no abundant supply of printable material of a uniform texture and convenient form. The supply of papyrus was strictly limited, strip had to be fastened to strip, and there was no standard size of sheet. Paper had yet to come from China to release the mind of Europe. Had there been presses, they would have had to stand idle while the papyrus rolls were slowly made. But this explanation does not account for the failure to use block printing in the case of illustrations and diagrams.
These limitations enable us to understand why it was that Alexandria could at once achieve the most extraordinary intellectual triumphs—for such a feat as that of Eratosthenes, for instance, having regard to his poverty of apparatus, is sufficient to put him on a level with Newton or Pasteur—and yet have little or no effect
