The question remains, what is this particle? The first impulse is to assume that it is the Basque definite article. The Basques, for instance, say _Guizon_, "a man," _Guizónac_, "the man," and _Guizónac_, "the men," besides using it in other cases, while their local proximity to the dolmen country would render such a connection far from improbable. Against this, however, it may be urged, that _ac_, as a terminal syllable, hardly ever occurs in the Basque provinces, and the names to which it is attached in France hardly seem to belong to that language. Another suggestion has been made,[391] that it is equivalent to the Greek word πὁλις, which would be exactly the signification for which we are looking, though in what language this occurs is by no means clear. For our present purpose, however, it is of little consequence what it may or may not be. It is sufficient to know that its occurrence is, as nearly as may be, coincident with the existence of dolmens. It does not occur to the eastward of the Rhone, nor do dolmens, though both are frequent on the right bank of that river; and it is not to be found in the east of France, in those countries which we have reason to believe were at the dawn of history essentially Celtic, and where the tumuli of the Bronze period exist in such numbers. It does, however, occur in that part of Cornwall south of Redruth and west of Falmouth,[392] where all the rude-stone monuments of that province are found, but it is not found anywhere else in Great Britain or Ireland. Nor is it found in the Channel Islands, though dolmens abound there; but this may be accounted for by the subsequent colonisation of these islands, as of Brittany in more modern times, by races of a different origin, who have to a great extent obliterated the original nomenclature of the country.