remained, and followed their old customs in spite of its partial occupation by the conquering Celts. We do not know at what period the Celts first invaded Gaul, but there seems no reason for supposing that it could not be very long before they first came in contact with the Romans; and if we may judge from the rate of progress which they made in subduing the rest of the country in historic times, their first invasion could hardly have been a thousand years B.C. All the tumuli in the east of France which have been dug into have yielded implements of bronze and metal,[383] and if they belonged to the Celts, this would fairly accord with the conclusions at which archæologists have arrived from other sources with regard to the Bronze age. It is not, however, worth while following up the question here; for unless it could be proved that the dolmens either succeeded or preceded the tumuli, it has no bearing on our argument. The fact of their occupying different and distinct districts prevents any conclusion of the sort being arrived at from geographical or external considerations. Their contents, if compared, might afford some information, but up to the present time this has not been done, and all we can at present assume is that there were two contemporary civilizations, or barbarisms, co-existing simultaneously on the soil of France. My impression is, however, that the Celtic barrow-builders were earlier converts to Christianity, and left off their heathenish mode of burial long before the less easily converted dolmen-builders of the west ceased to erect their Rude-Stone Monuments.