We have indeed already found it identical with a modern road. The modern high-road also corresponds with the old way for something like a mile at Otford over the Darent, and for two or three miles beyond; it is a modern road for more than half a mile before you reach the ferry at Snodland, and there is a road in construction which follows its track for some hundreds of yards on Gravelly Hill, near Caterham. For many miles of its course it is identical if not with high-roads at least with metalled lanes, as we had already found between Itchen Stoke and Bishop Sutton, and very commonly with unmetalled tracks or paths. But in all these cases it is broken: there are stretches of it unused. Modern advantages and modern necessities have left the Old Road continually to one side. Here for this very considerable distance it is identical with the great turnpike, and so remains identical up to and beyond its point of junction with the older 'Harrow Way' at Farnham. Can we discover any explanation for this coincidence of a prehistoric track with the high-road of our own time, which is almost indifferent to soil? for the crossing of the clay? for the neighbourhood of the river? A little consideration will enable us to do so. The hills which everywhere else afford so even a platform for the prehistoric road are here of a contour which forbids their use. To-day, as a thousand years ago, any road down this valley must have run upon this lowest line. The contour-lines, of which a rough sketch is here appended, are enough to prove it. [Illustration] There is a deep combe at Holybourne Down, two more on either side of Froyle, a fourth beyond Bentley, a fifth--smaller--before Farnham. All these gullies cut up into a hopeless tangle what in Surrey and Kent will become one unbroken bank of chalk. Any path attempting these hillsides would either have doubled its length in avoiding the hollows, or would--had it remained direct--have been a succession of steep ascents and falls; all the dry slopes which bound the vale to the north are a succession of steep and isolated projections, thrust out from the distant main chain of the chalk; many of them are crowned with separated summits. The road is therefore compelled to follow the valley floor with all the consequences I have noted.