32 MR. W. G. CLARICE ON NEOLITHIC MAN IN THBTFORD DISTRICT. 
the chipping of this type far surpassing that of any other in the 
district. The general similarity of the measurements of triangular 
knives is rather remarkable, the average being 1 ] by 1] inches. 
Two are chipped equally on both faces, three are slightly chipped 
on the flat hack surface, whilst the remainder have no chipping at 
all on the hack. The one leaf-shaped knife that I have is 2 by 1 
inches, ridged inch from the left side, to which it is smooth, the 
chipping running from the ridge to the right-hand side. Semi-oval 
knives are by no means uncommon, and the chipping on their 
worked edge generally compensates for the lack of it on other 
parts, one specimen having been rubbed down from the centre 
ridge to the edge, and then just touched round with exquisite 
fineness. 
Saws. — In England, flint saws are very rare, possibly on account 
of the delicate manipulation required, and the extreme fragility of 
the teeth. Indeed it seems hard to believe that they were ever 
intended for anything more than toys, though a medical man has 
expressed the opinion that the one represented 
in Figure 3 would be sufficiently strong to 
saw bone, and it has been suggested that it 
might have been used for such a delicate 
surgical operation as trepanning. This, the 
only specimen I have found, was picked up 
on Thetford Warren during a violent thunder- 
storm, the heavy rain having washed away 
the sand that covered it, and at the time was 
thought to be a flake, but subsequent examin- 
ation in my sanctum proved it to be a saw. 
The figure is a very accurate representation, and 
Pig 3 . the flake is of black flint, semi-transparent, 
Double-edged Saw. whilst there are nearly thirty teetli on each edge. 
Scrapers. — “ Scraper” is the most comprehensive term now used 
with reference to a type of flint implement, for it embraces so 
many widely-differing varieties, used for so many widely-differing 
purposes, that almost any implement with a rounded chipped edge 
is denominated a scraper. They are by far the most abundant 
implements in this locality, indeed, out of every 100, the proportion 
of scrapers is about 50, whilst 20 knives, 5 awls and borers, 5 chisels 
and fabricators, and 10 of the remaining types would complete the 
