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the subject. The best geological account is that given by Mr. W. Whitaker, F.R.S.^[1]

By the kindness of Mr. Worthington Smith most of the important specimens that he has found are now in my collection. I am further indebted to him for the use of the blocks illustrating some of the implements.^[2] Fig. 453a exhibits a finely pointed implement from Lower Clapton. Its surface is lustrous and it shows at its butt part of the original crust of the nodule of flint out of which it was chipped.

Fig. 453a.—Lower Clapton. 1/2

The fine ovate implement,^[3] Fig. 453b, came from the 12 feet stratum at Stamford Hill. It is of dark colour, lustrous, and has the angles slightly abraded.

A small example from the Palæolithic floor at Stoke Newington is shown in Fig. 453c.^[4] The edges are still quite sharp, and at one place there appear to be races of use. A quartzite^[5] implement from the same locality is shown in Fig. 453d.

Implements presumably of Palæolithic Age have been found in the bed of the Thames. One from Battersea is of peculiar form, with a

1. Mem. Geol. Survey, "The Geology of London, &c.," vol. i., 1889.
2. "Man the Prim. Sav.," p. 222, fig. 148.
3. Op. cit., p. 225, fig. 151.
4. Op. cit., p. 239, fig. 165.
5. Op. cit., p. 224, fig. 150. See also Trans. Herts Nat. Hist. Soc., vol. viii., 1896. pl. xiii., xiv.