370 ON THE CO-EXISTENCE OF MAN 
those that are polished, which he assigns to the second subdivision. 
It is to be presumed that the want of instruments with polished sur- 
faces and having a fine cutting edge must have been felt from the 
earliest time, when the people had learned to fix, by a much more 
difficult process, to flints and other rocks intentional forms so well 
defined. 
Among the bones with incisions obtained from the sands of Abbe- 
ville, there is a large antler of an extinct Stag, referred to the Cervus 
Somonensis, or the grand Daim de la Somme of Cuvier, together with 
several horns of our common Deer, which I was not able to show you. 
The bones of the Rhinoceros (Rh. tichorhinus) which I laid before 
you were found at Menchecourt, a suburb of Abbeville, where there 
are gravel-pits which formerly afforded many fossil bones of Elephants, 
&c., and.where M. Boucher de Perthes, at a later period, obtained the 
flints worked by human hands. The incisions that may be observed 
on those bones are neither so deep, nor do they afford evidence so 
striking, as those in the bones of the Aurochs from the Canal de 
POureq ; but the shallow cuts and the incisions of the bony surfaces 
which may be observed upon them, especially in the articulations, have 
in my eyes not less value; for I have satisfied myself, by comparative 
trials on homologous portions of existing animals, that incisions pre- 
senting such appearances could only be made in fresh bones still 
retaining their cartilage. As to the fragment of the horn of the 
Megaceros Hibernicus, which Cuvier had received from England with- 
out any indication as to where it came from, you may have observed 
that it bears the marks of several blows, which have made incisions of 
a depth that it would be impossible to produce in the present state of 
mineralization of that fragment; further, the blow which detached 
that piece from the rest of the horn must have been given before 
that immersion in the sea which caused its fossilized condition; for 
in the internal cavity of this fragment there was found the valve of 
an dnomia (preserved with the specimen), which could not have found 
its way there except at the place of fracture. I have observed very 
Significant marks, evidently produced by a sharp tool, on the horn of 
a young Megaceros which the late M. Alcide d’Orbigny had received 
from Ireiand some years ago. 
I would call to your recollection that the Rev. John Cumming, in 
his geological description of the Isle of Man, (Quarterly Journal of 
the Geological Society, vol. ti. p. 345), notices the occurrence of the 
