The second is the clay. A belt of gault of greater or lesser width stretches all along the Downs just below the chalk. Here it is particularly wide, and no straight line can be taken from Wrotham to the Aylesford gravels without crossing nearly two miles of this wretched footing, which, throughout its course, the road has most carefully avoided. That a ford of great antiquity was there; that the men of the sandy heights used it; that the Romans used so admirable a ford (it is gravel near the river on either side), that they bridged it, that they made a causeway over the clay, and that this causeway and that bridge were continuously used after their time, I am willing to believe; but not that the prehistoric road along the chalk hills could have waded through all that clay to reach it, and have gone out of its way into the bargain. Thirdly, there is the clinching fact that a number of prehistoric remains, Kit's Coty House and the rest, lie to the _north_ of such a crossing, and that to reach Boxley itself, a site indubitably dependent upon the prehistoric road, a man crossing at Aylesford would have to turn _back_ upon his general direction. It must further be remembered that by the seventh century some of the valleys had acquired firm roads, inherited from the old civilisation, and that in the rout after a battle, an army making for a tidal river, and not able to choose their own time of crossing (as can a wayfarer), would certainly make for a point as far up the stream as possible and for a bridge. If Cuxton and Aylesford, then, are to be neglected (as I think they certainly must be), there remain only Lower Hailing and Snodland. At first sight the weight of argument is for Lower Halling, and if the various parts of such an argument as I adduce have different proportions from those I lend them, one might conclude that at Lower Halling was the original passage of the Medway. True, there is for the passage at Lower Halling but one evidence that I can discover, but it is an evidence of the greatest weight, and such an one as is often permitted alone to establish a conclusion in archæology. It is this, that there was good surface over the original soil from the Pilgrim's Way on the hills above, right down to the river-bank at this point. No clay intervenes between the chalk and gravel. The primitive traveller would have had fairly dry land all the way down to the river. Even beyond the river the belt of alluvial soil is less broad than it is at Snodland; and altogether, if the geological argument alone were considered, the decision undoubtedly would be given to this place. The claims of Snodland are asserted by a number of converging arguments. I will enumerate them, and it will, I think, be seen that though each is individually slight, the whole bundle is convincing.