Relics that can be attributed with certainty to the prehistoric Iron Age are rare, partly, no doubt, because iron so quickly rusts away. Some very remarkable remains of this period were however found on Stamford Hill near Plymouth, during the construction of a fort, when the workmen dug into an ancient burial-ground, in which, in addition to human bones, were discovered red, black, and yellow pottery, mirrors and finger rings of bronze, fragments of beautiful amber-tinted glass, and some much-corroded cutting-instruments of iron. In the old camp called Holne Chase Castle, a man digging out a rabbit came upon about a dozen bars of rusty iron, two feet long, nearly two inches broad, and a quarter of an inch thick, which although at first mistaken, as has been the case elsewhere, for unfinished sword-blades, were subsequently identified as specimens of the iron currency-bars which passed as money among the ancient Britons. British coins of gold, silver, and copper have been found in several places, particularly at Exeter and at Mount Batten near Plymouth. The commonest are of what is known as the Channel Islands type, bearing the effigy of a horse rudely imitated from the Macedonian stater, and probably struck about 200 B.C. A special feature of the prehistoric antiquities of Devonshire is the great number of camps or hill-forts, of which there are more than 140; some in the heart of the county, some on the coast, often on prominent headlands, and some along the lines of division between this and the adjoining shires; showing in many instances great military skill and knowledge both in construction and in the choice of good, defensive sites. Two of the most remarkable of the many strongholds, both near Honiton, are the great encampment of Dumpdon and the magnificently planned fortress of Hembury--a monument of military skill. Another fine example is Hawkesdown, the strongest of the chain of border forts--of which Membury and Musbury are two important links--built along the river Axe as defences against the ancient inhabitants of Dorsetshire. One of the largest and most elaborate of all is Clovelly Dykes, twenty acres in extent, and defended by from three to five lines of intricate earthworks. Another remarkable fort, and the largest in the county, is Milber Down, two miles south-east of Newton Abbot. [Illustration: Bronze Centaur forming the Head of a Roman Standard (Found at Sidmouth)]