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276 chipping, as is the case with the long flakes from Pressigny (Fig. 6), but this method appears to have been almost unknown in Britain.

3. Flat, where the external face is nearly parallel to the internal, and the two edges are formed by narrow facets, as in Fig. 200.

4. Polygonal, where the external face consists of many facets, as in Fig. 192.

These several varieties may be long or short, broad or narrow, straight or curved, thick or thin, pointed or obtuse. The character of the base may also vary, being rounded or flat, thick or thin, broad or narrow.

The cores from which flakes have been struck are, of course, of various forms, some having had only one or two flakes removed from them, and others several. In the latter case they are often more or less regularly polygonal, though only few of the facets will be of the full breadth of the flakes, as the external face of every successive flake carries off some part of the traces of those previously struck off. Not unfrequently some of the facets are arrested at a little distance from the end where the blows were struck, in consequence of the flake having broken short off, instead of the fissure continuing to the end of the block. Occasionally, and more especially on the Yorkshire Wolds, the nuclei are very small, and much resemble in character those found, with numerous flakes, in India, in the neighbourhood of Jubbulpore.

It has been suggested that cores were occasionally made on purpose for use as tools; but this appears very doubtful. Of course, if a core were at hand, and seemed capable of serving some special purpose, it would be utilized.

The core here engraved of the full size in Fig. 189 was found by myself at Weaverthorpe, Yorkshire. I have already suggested that in striking off such small flakes as those removed from this core, some sort of punch may have been used, instead of the blows being administered directly by a hammer. We have no conclusive evidence as to the purpose to which such minute flakes were applied, but they may have been fashioned into drills or scraping or boring tools, of very diminutive size. Such small objects are so liable to escape observation, that though they may exist in considerable numbers, they are but rarely found on the