A simple sketch map of the Colne River, extending southwards to the ‘R. Thames’ at ‘Stanes’ and ‘Thistleworth’ (Isleworth) and eastwards to Harrow on the Hill.

It is a close copy, the spellings modernized and lightly corrected, of a map in Sir Edward Forde’s ‘A Desinge for bringing a navigable river from Rickmansworth in Hartfordshire, to St. Gyles in the Fields … (London, 1641), reprinted in 1720 as ‘A design for bringing a navigable river from Rickmansworth in Hartfordshire to St. Giles’s in the Fields’; the benefits of it declared, and the objections answered. … With an answer to the whole, printed in the same year, and both reprinted, 1720, from which this map is thought to originate. ESTC calls for a map in this book, but the BL copy lacks the map, although an exemplar is found separately in the Map Library.