55 
argillite pebble slightly whetted on the side, which was the natural surface 
of the pebble. One edge was smoothed nearly flat by longitudinal rubbing, 
and nearly half of the edge has since been broken away. Close to this 
break, or near the middle of this edge of the whetstone, is a single offset or 
step similar to the two on the whetstone described below. A flat, oblong 
pebble, a little over \ inch thick and about 2 by 4 inches, found in heap A, 
is whetted on both sides. Another specimen found in heap A is an argil- 
lite pebble, about | inch thick by 4 inches long by 2 wide, whetted with 
longitudinal striations over most of one side and in patches on the other 
side. One edge of this specimen is ground somewhat flat, with a sharp 
angle where it meets the sides. There are two offsets on this edge (figure 3) 
which are again referred to on page 56. An end of a gritty pebble about 4 
inches long, whetted in patches over most of both sides and one edge, 
was also found in heap D. A flat, waterworn fragment of an argillite 
pebble about \ inch thick, 2 wide, and about 5 inches long, whetted on 
both sides, was found in heap D. One specimen found in heap A looks 
like a section of a large celt, and is worn on both broken ends, but unlike 
most of the celts found, is of sandstone. It is whetted all over, except 
on the ends, and cracked by fire. A whetstone from heap M made of an 
irregularly rectangular slab of sandstone, about 2 inches wide, 4 inches 
long, and nearly § inch thick, is worn smooth on both sides and has all 
the edges rubbed. 
Of the fragments of slabs of sandstone, one is from heap A and four are 
from heap D. One from heap D is rubbed on one side, the other four 
specimens on both sides. The one rubbed entirely over one side only is 
about \ inch thick by 2| inches long. Of the four rubbed entirely over 
both sides, one from heap D is about 1\ inches thick by 3 inches across, 
another about ^ inch thick by 2f inches long, and still another about § 
inch thick by 4 inches long. A fourth, found in heap A, is a waterworn 
slab of sandy argillite less than | inch thick by 2\ by 4 inches. 
There are three fragments of irregular pieces of sandstone from heap 
D. Two are rubbed entirely over one side, one on both sides. Of the 
two rubbed on one side one is thick, the other about 3 by 4 inches. The 
one rubbed entirely over both sides is from f to -f inch thick and 1 by 2 
inches. 
The three plough grinders each have one edge that is bevelled from 
both sides and flattened on the very edge probably from use. One was 
found in heap A and two in heap D. The one found in heap A (Plate XV, 
figure 2) is made of a fragment of mica schist slightly over 6 inches long 
by 2| inches wide and less than § inch thick. One long, narrow edge is 
slightly rounded from the flat by longitudinal grinding, and on both sides 
near the edge the surface has been slightly ground on a bevel to smooth 
the slope from the sides to this edge. The other edges are not bevelled. 
It has been whetted slightly in the middle of the reverse. This whetting 
and the plough edge are the only signs of artificial work on this angular 
and apparently un weathered rock. 
The two other plough grinders are made from fragments of fine sand- 
stone about \ inch thick, 2 inches wide, and 3 inches long, and are whetted 
on both sides. The first is bevelled on each side of the longest edge, which 
is flattened probably from use. The other plough grinder has one side 
