With the Cornish tin he would combine "the Roman cinders and iron-stone in the Forest of Dean, which makes the best iron for most uses in the world, and works up to the best advantage, with delight and pleasure to the workmen." He then described the history of his own efforts to import the manufacture of tin-plates into England some sixteen years before, in which he had been thwarted by Chamberlaine's patent, as above described,--and offered sundry queries as to the utility of patents generally, which, says he, "have the tendency to drive trade out of the kingdom." Appended to the chapter on Tin is an exceedingly amusing dialogue between a tin-miner of Cornwall, an iron-miner of Dean Forest, and a traveller (himself).

From this we gather that Yarranton's business continued to be that of an iron-manufacturer at his works at Ashley near Bewdley.

Thus the iron-miner says, "About 28 years since Mr.Yarranton found out a vast quantity of Roman cinders, near the walls of the city of Worcester, from whence he and others carried away many thousand tons or loads up the river Severn, unto their iron-furnaces, to be melted down into iron, with a mixture of the Forest of Dean iron-stone; and within 100 yards of the walls of the city of Worcester there was dug up one of the hearths of the Roman foot-blasts, it being then firm and in order, and was 7 foot deep in the earth; and by the side of the work there was found a pot of Roman coin to the quantity of a peck, some of which was presented to Sir [Wm.] Dugdale, and part thereof is now in the King's Closet." [21] In the same year (1681) in which the second part of 'England's Improvement' appeared, Yarranton proceeded to Dunkirk for the purpose of making a personal survey of that port, then belonging to England; and on his return he published a map of the town, harbour, and castle on the sea, with accompanying letterpress, in which he recommended, for the safety of British trade, the demolition of the fortifications of Dunkirk before they were completed, which he held would only be for the purpose of their being garrisoned by the French king.

His 'Full Discovery of the First Presbyterian Sham Plot' was published in the same year; and from that time nothing further is known of Andrew Yarranton.

His name and his writings have been alike nearly forgotten; and, though Bishop Watson declared of him that he deserved to have a statue erected to his memory as a great public benefactor, we do not know that he was so much as honoured with a tombstone; for we have been unable, after careful inquiry, to discover when and where he died.
Yarranton was a man whose views were far in advance of his age.