In the Proceedings for 1915–16, Vol. II., p. 230, evidence was given which seems to show that the chipped flints of Windmill Hill, Avebury, belong to the Neolithic and Bronze Ages. Thirtynine implements were illustrated, bearing very close resemblance to specimens from Grime's Graves, illustrated in the Report; and showing that the same types were made, and that the same style of workmanship prevailed at both sites. The conclusion was drawn that Grime's Graves is not earlier than the Neolithic Age.

In the Proceedings for 1916–17, Vol. II., p. 339, in an important paper, Mr. W. G. Clarke gave other evidence supporting the view of a Neolithic date for Grime's Graves.

In the present paper, further evidence is brought forward pointing to Neolithic (and Bronze Age) dates for the Windmill Hill flints, and, therefore, also, for Grime's Graves; by reason, as aforesaid, of the close resemblance between the chipped flints from the two sites.