are small pieces of clay, somewhat crudely shaped into a form resembling a pillow, and thickly inscribed with cuneiform characters. Similar use has been seen in hollow cylinders, or prisms of six or eight sides, formed of fine terracotta, sometimes glazed, on which the characters were traced with a small stylus, in some specimens so minutely as to require the aid of a magnifying-glass. In Egypt the principal writing material was of quite a different sort. Wooden tablets are found pictured on the monuments; but the material which was in common use, even from very ancient times, was the papyrus, having recorded use as far back as 3,000 BCE. This reed, found chiefly in Lower Egypt, had various economic means for writing. The pith was taken out and divided by a pointed instrument into the thin pieces of which it is composed; it was then flattened by pressure, and the strips glued together, other strips being placed at right angles to them, so that a roll of any length might be manufactured. Writing seems to have become more widespread with the invention of papyrus in Egypt. That this material was in use in Egypt from a very early period is evidenced by still existing papyrus of the earliest Theban dynasties. As the papyrus, being in great demand, and exported to all parts of the world, became very costly, other materials were often used instead of it, among which is mentioned leather, a few leather mills of an early period having been found in the tombs. Parchment, using sheepskins left after the wool was removed for cloth, was sometimes cheaper than papyrus, which had to be imported outside Egypt. With the invention of wood-pulp paper, the cost of writing material began a steady decline. Wood-pulp paper is still used today, and in recent times efforts have been made in order to improve bond strength of fibers. Two main areas of examination in this regard have been "dry strength of paper" and "wet web strength". The former involves examination of the physical properties of the paper itself, while the latter involves using additives to improve strength. Uses and implications of writing Writing and the economy According to Denise Schmandt-Besserat writing had its origins in the counting and cataloguing of agricultural produce, and then economic transactions involving the produce. Government tax rolls followed thereafter. Written documents became essential for the accumulation, accounting, of