MR. W. G. CLARKE ON NORFOLK FLINT IMPLEMENTS. 22g 
arenaceous areas much more delicate, but they are of better 
design than those from the heavy lands. Many well-known 
forms, such as arrow-heads, spear-heads, lance-heads, needle- 
scrapers, and saws first appear, and the more delicately chipped 
triangular knives, awls, borers, hollow scrapers, fabricators, 
axes, and scrapers are only found among the sandy site X eoliths. 
Numerous implements are of semi-transparent flint, the flakes 
being very thin, and they generally occur in large quantities. 
'Some are weathered a bluish colour, and many of these have 
been rechipped. As the rechipped portions have not weathered 
at all it is obvious that even this section of the Neolithic 
period must have been of long duration. Isolated specimens 
of the sandy site Neoliths are found in boulder clay areas, 
and boulder clay implements not infrequently occur in 
localities where the sandy site implements are extremely 
abundant. With regard to the number of sandy site imple- 
ments, on August 31st, 1905, Mr. W. A. Dutt and 1 measured 
off a rod of land in the parish of Santon not far south-east of 
Grimes Graves. It was on a “breck” probably ploughed 
about ten years ago. Furrows divided it into ten strips. 
Of these the six nearer the river were extremely productive, 
the upper four not to nearly so great a degree. Our measure- 
ment was made on the seventh strip from the river, on which 
we found far fewer implements than on the strips lower down. 
We counted every piece of chipped flint lying on the surface 
of the rod we had enclosed. There were no really first-class 
implements, but those which were undoubtedly of human 
workmanship were : 1 chisel, 2 hollow scrapers, 4 borers, 
5 scrapers, 5 large implements, 10 knives, 28 flakes, and 74 
chips, a total of 129. Taking this as an average of the purely 
surface implements on one square mile of “ breck ” land, 
we get the astounding total of 13.209,600 worked flints. 
There are many miles where similar totals could be obtained 
and the various horizontal layers would add incalculably to 
the number. Leaving out of account the flakes and the chips, 
evidence that the implements were manufactured on the 
spot, probably of flint obtained from Grimes Graves, the 
number of implements on the rod was 27, which gives 2, 764,800 
