74 
LAW AND HORSFALL : FLINT IMPLEMENTS. 
pillars, thus indicating- the position they occupied before the ground 
was bared. 
The original covering of this hill consisted of a dry sandy 
loam, about eight or ten inches thick, which supported the growth 
of hent, a peculiar grass, rich in silica. This is proved by the 
occurrence at several points on the bare ground of small patches 
of soil which escaped the action of the fire referred to above. It 
Avill thus be seen, that the conditions for the formation of vegetable 
matter have been so unfavourable at this place, owing to the dry- 
ness of the ground, as to make it probable that the flints found 
there, though under so thin a soil, are quite as ancient as those occurr- 
ing' at much greater depths, in localities more favoumble for the 
gTowth of peat. To the south, south-west and north of this hill, 
other prominent hills are located on which many fragments of 
flint have been found, among these, Knowl Hill and Bull Hill may 
be mentioned as being the most important on account of their 
having yielded implements undoubtedly worked by human hands. 
A rather rude form of arrowhead with broken point, a flint 
core and a few chips have been found at Knowl Hill, while from 
Bull Hill we have obtained an arrow head with one of its barbs 
broken, one or two delicately worked bits of flint, and a few chips 
and flakes. On Bull Hill the flints appear to have been covered at 
one time with peat, varying from one to six feet in thickness. 
From a ridge of high ground known as Midgley Moor about 
two miles north of Mytholmroyd, several flints have been obtained, 
among' which a small leaf -shaped arrow head, a circular thumb- 
flint and two worked flakes, may be mentioned. The subsoil on 
which they were found, in almost every instance, has been laid bare 
by fires occurring from time to time. 
In conclusion, it may not be out of place to call attention to 
one or two points in relation to the flints we have already dis- 
covered. 
Firstly, the well-formed barbed arrow-heads and other well- 
worked flints were so associated with those showing little or no 
