In 1681 he published the second part of 'England's Improvement,'[20] in which he gave a summary account of its then limited growths and manufactures, pointing out that England and Ireland were the only northern kingdoms remaining unimproved; he re-urged the benefits and necessity of a voluntary register of real property; pointed out a method of improving the Royal Navy, lessening the growing power of France, and establishing home fisheries; proposed the securing and fortifying of Tangier; described a plan for preventing fires in London, and reducing the charge for maintaining the Trained Bands; urged the formation of a harbour at Newhaven in Sussex; and, finally, discoursed at considerable length upon the tin, iron, linen, and woollen trades, setting forth various methods for their improvement. In this last section, after referring to the depression in the domestic tin trade (Cornish tin selling so low as 70s. the cwt.), he suggested a way of reviving it. 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]