Besides being converted into round-ended scrapers, and pointed boring-tools, flint flakes were trimmed on one or both faces into a variety of forms of cutting, scraping, and piercing tools, and weapons. In one direction these forms pass through daggers and lance-heads, into javelin and arrow heads; and in another through cutting tools, wrought into symmetrical shape, and ground at the edges, into hatchets or celts adapted for use in the hand without being hafted. [Illustration: Fig. 233.—Cambridge (1). 1∕2] The first I shall notice are flakes trimmed into form by secondary working on both edges, but only on the convex face, the flat face being left either almost or quite intact. The illustrations of these forms are no longer full size, but on the scale of one half, linear measure. * * * * * The simplest form of such instruments is when merely the edge of the flake is worked, so as to reduce it to a regular leaf-like shape. A beautiful specimen of this kind is preserved in the Christy Collection, and is shown in Fig. 233. It was probably found in the neighbourhood of Cambridge, having formed part of the collection of the late Mr. Litchfield of that town. It is of grey flint, curved lengthwise, as is usually the case with flint flakes, and worked to a point at each end, though rather more rounded at the butt-end of the flake. Such instruments have sometimes been regarded as poignards, though not improbably they were used for various cutting and scraping purposes. They rarely occur in Britain of so great a length as this flake, which is 5 1∕2 inches long, but those of shorter proportions are not uncommon. In Ireland also the long flakes are scarce.