Woolwich stones, still collected in that locality, are simply waterworn pebbles of flint, which, when broken with a hammer, exhibit on the smooth surface some resemblance to the human face; and their possessors are thus enabled to trace likenesses of friends, or eminent public characters. The late Mr. Tennant, the geologist, of the Strand, had a collection of such stones. In the British Museum is a nodule of globular or Egyptian jasper, which, in its fracture, bears a striking resemblance to the well-known portrait of Chaucer. It is engraved in Rymsdyk’s “Museum Britannicum,” tab. xxviii. A flint, showing Mr. Pitt’s face, used once to be exhibited at the meetings of the Pitt Club. — B.
This text comes from a footnote on a diary entry in the 1893 edition edited by Henry B. Wheatley.