A barrow is an unmistakable thing. You open it and you find a tomb.
Whatever may be said of paleolithic man, neolithic man has left the most enduring and indubitable evidence. He worked in the most resisting of materials, and he worked well.
A Roman road is a definite thing. Its known dimensions are a guide for our research: the known rules of the Roman engineers. The strata of material, often the embankment, remain. Its long alignments have but to be recovered in a couple of points to establish its direction through a considerable stretch of country. Did a man but know the ridge over Gumber Corner and down Bignor Hill, the Billingshurst Road, the hard foundations through Dorking Churchyard, it would be enough to make him certain of the Stane Street.
But of all the relics of antiquity the prehistoric road is the most difficult to establish.
These old tracks, British, and (if the word has any meaning) pre-British, though they must abound in the island, have become most difficult to reconstitute.
The wild, half-instinctive trail of men who had but just taken on humanity: later a known and common track, but a track still in the hands of savages for countless generations, a road of this kind is preserved by nothing stronger than habit. No mathematical calculation presided at its origin, none can therefore be used to reconstruct it when it has been lost. When (as in the last phase of the road which is the subject of this book) religion may have prolonged its use into historic times, that influence is capable indeed of perpetuating a tradition; but though religion maintains a shrine or a legend it does not add those consistent records of material works which are the best guide for the research of posterity.
The Old Road was not paved; it was not embanked. Wherever the plough has crossed it during the last four hundred years, the mark of it is lost.
From the clay it has often disappeared: from marshy soil, always. On the chalk alone has it preserved an unmistakable outline. Nor can it be doubted that it would have vanished as completely as have so many similar roads upon the Continent and in our own Midlands, had it not been for one general, and three particular, influences which, between them, have preserved a proportion of it sufficient to serve as a basis for the exploration of the remainder.
The general influence was that political sequence by which England has developed a peculiar power for retaining the evidences of her remote past. The three particular influences were, first, the Canterbury pilgrimage; secondly, the establishment of a system of turnpikes in the eighteenth century; thirdly, and most important of all, the chalk.
Consider first the general influence: the effect of English society upon this matter.