102 VI. Primaeval Man in the Valley of thr Lea.1 By Worthington G. Smith, F.L.S., M.A.I., &C. [Read April 29th, 1882; revised April, 1883.] Avus Implementorvm omnivm Palaeolithicorvm, qvae svnt a me reperta in Valle Thamesis, apvd Mvsaevm Britannicvm deversatvr,—"CCXLVI. Conyers." By Primaeval Man I mean Man of whom we have the earliest authentic and accepted evidence. I do not refer to the very early inhabitants of Britain commonly known as the Silurian or Neolithic tribes, or to the Kelts, but to that great cohort of men who once lived near ancient river-sides, and there left their chipped unpolished weapons and tools of flint, chert, felstone, quartz, quartzite, porphyry, and various other stones. No doubt, as I think, these river-side men were preceded for vast periods of time—though possibly not where England now is—by other men or men-like animals, and these, our (at present unknown) remote precursors, might perhaps more properly be termed primaeval men. The evidence, however, of the existence of such early tribes (even if any evidence has at present been discovered) is, to me, of a slight and uncertain nature. I prefer therefore to consider that little or nothing is known of primaeval man prior to the deposition of the beds of gravel, sand, and loam generally found as terraces bordering our present rivers or their affluents. These gravelly, implementiferous positions are chiefly confined to the rivers of North-Western Europe, although stone weapons of apparently vast antiquity have now been found in drift beds generally bordering the rivers of all four quarters of the globe. 1 [We are greatly indebted to Mr. Worthington G. Smith for the numerous woodcuts illustrating this paper, drawn and engraved by him- self. Since the reading of the essay it has been carefully revised and brought up to date by the author.—Ed.]