Primaeval Man in the Valley of the Lea. 103 The precursors of the river-side men have, as far as we know, left no implements of stone for recognition; it is probable that the very earliest men used naturally-broken splinters and flakes of stone as tools and weapons. At last the time arrived when some individual discovered that by striking a hard, tough stone—like a quartzite pebble—on to a hard and brittle one like a block of flint, that sharp knife- like splinters, slices, or flakes would fly off from the flint, and these splinters were the first artificially-made implements used by the earliest men. The discovery of the art of splintering or flaking was quite possibly unpremeditated, and arose from seeing a block of flint accidentally shattered. The ancient river-side men, to whom I refer as primaeval men, are everywhere known as Palaeolithic men, because they were the men who fabricated the most ancient stone implements yet accepted as undoubted human work. The rough unpolished stone implements of the Paleolithic men are distinguished in various ways from the tools made by the Neolithic men of later times. The former and more ancient tools are commonly found embedded in undisturbed gravel, sand, or loam, in company with fossil bones belonging to animals many of which are now extinct. These implements are never polished, and they are often abraded or water-worn, owing to their being transported and washed about by the ancient stream on whose banks they were made. Neolithic im- plements, or implements belonging to a very much more recent period, are generally found on or but little beneath the sur- face ; they are frequently partly or wholly polished, and the bones found with them are neither in a fossil nor semi-fossil condition. It is to the works of the Palaeolithic men—and chiefly those men who formerly lived in the Lea Valley—that I now pro- pose to direct attention. These old river-side men lived on the ancient stony banks of the Lea; they picked up the flints that were at their feet, and from these stones fabricated their weapons and tools. Successive floods of river-water, often slight, repeatedly covered up these flint tools with sand, loam, or gravel; and now, when excavations are made in the