The number of such arbitrary characters in the Chipeway notation is said to be over two hundred, but if the distinction between a figure and a symbol were rigidly applied, it would be much reduced. This kind of writing, if it deserves the name, was common throughout the continent, and many specimens of it, scratched on the plane surfaces of stones, have been preserved to the present day. Such is the once celebrated inscription on Dighton Rock, Massachusetts, long supposed to be a record of the Northmen of Vinland; such those that mark the faces of the cliffs which overhang the waters of the Orinoco, and those that in Oregon, Peru, and La Plata have been the subject of much curious speculation. They are alike the mute and meaningless epitaphs of vanished generations. I would it could be said that in favorable contrast to our ignorance of these inscriptions is our comprehension of the highly wrought pictography of the Aztecs. No nation ever reduced it more to a system. It was in constant use in the daily transactions of life. They manufactured for writing purposes a thick, coarse paper from the leaves of the agave plant by a process of maceration and pressure. An Aztec book closely resembles one of our quarto volumes. It is made of a single sheet, twelve to fifteen inches wide, and often sixty or seventy feet long, and is not rolled, but folded either in squares or zigzags in such a manner that on opening it there are two pages exposed to view. Thin wooden boards are fastened to each of the outer leaves, so that the whole presents as neat an appearance, remarks Peter Martyr, as if it had come from the shop of a skilful bookbinder. They also covered buildings, tapestries, and scrolls of parchment with these devices, and for trifling transactions were familiar with the use of _slates_ of soft stone from which the figures could readily be erased with water.[11-1] What is still more astonishing, there is reason to believe, in some instances, their figures were not painted, but actually _printed_ with movable blocks of wood on which the symbols were carved in relief, though this was probably confined to those intended for ornament only.