equally applicable to the ones in question. He says: "We find,
on comparing a specimen of these chipped stones with an
accidentally fractured pebble, that the chipped surfaces of the
former all tend toward the production of a cutting edge, and
there is no portion of the stone detached which does not add to
the availability of the supposed implement as such; while in the
case of a pebble that has been accidentally broken, there is
necessarily all absence of design in the fracturing."<33>

Like the watch found on the moor, they show such manifest
evidence of design, that we can not doubt that they were
produced by the hand of man. But it is not enough to know that
they are artificial, we must also know that they are of the same
age as the beds in which they are found.


Section of Gravel Pit.-----------


This cut represents a section of a gravel pit at St. Acheul, on
the Somme. The implements are nearly always found in the lowest
strata, which is a bed of gravel from ten to fourteen feet
thick. Overlying this are beds of marl, loam, and surface soil,
comprising in all a depth of fourteen feet. It has been
suggested that the implements are comparatively recent, and have
sunk down from above by their own weight, or perhaps have been
buried in artificial excavations. The beds are however too
compact to admit of any supposition that they may have been sunk
there; and if buried in any excavation, evident traces of such
excavation would have remained. We can account for their