330 NATURAL SCIENCE [November 
long by 5 cm. wide. One surface is flat and smooth, while the 
other is convex and rough, as about one-fourth of it is part of the 
original surface of the flint. From the convex side two large flakes 
have been forced off, probably by frost, and no doubt at about the 
same time as the formation of the flat face. Both sides of the flint 
are scratched. After the scratching a thin coating of white silica 
was deposited over the two large-flaked surfaces, filling up some of 
the scratches. And after this a second set of scratches has cut 
across the siliceous encrustation. 
The history of the chipping of this specimen is as follows :—The 
curve at @ is the result of natural forces acting on the thin edges of 
a natural hollow of the flint: the hollow retains the original surface, 
except at the edge, where three or four small chips have been forced 
off at a period later than the flaking. The single chip at 6 has 
been forced off from the other side of the flint, and probably dates 
from about the same period as the chips of the a series. 
The almost straight side of the specimen (c) was formed by 
chipping at a much earlier period, before the stone was stained red, 
but later than the large frost flakes. 
This specimen therefore exhibits surfaces of four distinct dates— 
1, The original surface of the flint. 
2. The flat side and the two large frost flakes. 
3. The chippings on the straight edge before the iron- 
staining. 
4+, The chippings at a and 0 subsequent to the iron-staining. 
No. 4390. A flint from Branshatch (Fig. 2) 14 em. long by 8 em. 
wide. This specimen has the original rough surface of the flint on 
one face and a flat frost-flaked surface; both have been encrusted 
by silex. The specimen is much chipped. The chips have been 
forced off by pressure mostly from the flat side, but at the larger end 
the chipping was done from,both sides, forming a slight irregular 
ridge. The significant point about this specimen is that most of the 
chipping occurred subsequent to the dark staining of the flint. 
No. 2711. A tablet of very dark-red flint from Rogersfield, near 
Ightham, measuring 15 em. by 9°5 em. This slab of flint was also 
chipped before the date of the staining, and also shews chipping by 
pressure from opposite sides. The chips are of different dates; the 
first and second sets are scratched, and the third set are insignificant 
and irrelevant to the main chipping. The whole surface is encrusted 
by silica except where it chipped. 
No. Pit VI. A triangular slab of flint (Fig. 3) probably flaked from 
a large block by frost. The original surface occurs on the convex side 
and extends over a third of the edge marked a. Ancient chippings 
from opposite sides occupy the edges d, and some of about the same 
date occur along b. These chips were all earlier than the iron- 
