NEOLITHIC TRACKWAY 179 the evidence along this limb of the trackway, and our last excur- sion was made in an attempt to find the northern end. We made the assumption that possibly this track was the lost southern extremity of the Norfolk feature known as "Peddar's Way." We followed Peddar's Way from the Wash to Castle Acre, but found that the only boulders associated with it were of basalt and grit. On the other hand we did accidentally discover five blocks of conglomerate : 1. Under the buttress of Heacham Church (62/682380). 2. In the wall of a house at Snettisham (62/682347). 3. In the foundations of the ruins of Snettisham old church (62/691344). 4. At Grimstone (62/722222). 5. At Gayton (62/732193). With the exception of No. 2, these points lie on a straight line, which extended southwards, fell exactly across the site of the Neolithic flint-mines at Grimes Graves. The striking similarity between the Norfolk stones and those found in Essex is strong presumptive evidence that the two tracks are concurrent. The strongly suggestive link with Grimes Graves leads us to the corollary that this track is probably the old flint trading route for the East Anglian settlements. The manner in which the track keeps to the ridges of the hill, avoiding all towns and villages, and apparently unconnected with any recog- nised Bronze Age sites or roads; indeed the very nature of the markstones themselves; all these facts point circumstantially to the same conclusion, although considerable field work remains to be accomplished before final proof. The western end of the track has been far more difficult to trace. Hertfordshire is a built-up area, with a maze of new suburbs and arterial roads, and only recently have we hit upon the probable course. A line of four boulders of Herts conglomerate, sighted in a straight line from Flamstead End (345035) to Appleby Street (330045) runs west-north-west from a site marked "Roman Camp" on the map (352030). Eastwards the track would pass through the suburbs of Cheshunt and across the River Lea marshes to join the Essex track at Fishers Green. Westwards the track has not yet been investigated, but a number of vague clues lead to St. Albans, and it is true that at Kingsbury Mill ford over the River Ver, at Verulam, there are typical conglomerate blocks. Others stand in the gateway leading to the Roman Theatre site, and another was in- corporated in the Theatre building itself and can now be seen among the ruins. Very recently we have discovered conglomerate boulders under the buttresses of Chesham Church and in Chesham