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Rh The elaborate monuments, such as are described in the next chapter, must have been worked almost entirely with stone implements, though copper chisels, hardened at the edge by hammering, may have been used to a limited extent; indeed blocks of stone have been found bearing marks which could hardly have been made except by a metal tool. Stone, including jadeite, and obsidian must have furnished by far the larger proportion

of the implements used by masons and carvers, and the latter was imported into Yucatan from the volcanic districts. Examples of stone-flaking are not very common in the Maya area, but little excavation has been carried out. It must have been widely practised, since the glyph representing a knife, and the spear-heads as shown on the reliefs, both exhibit marks indicating flaking. Objects of flaked stone, of a very interesting class, are found in some numbers in British Honduras; these include obsidian arrow-heads of extremely graceful design, and a large number of what may be