It is a disputed question whether the Phœnicians discovered the tin-stones and the stream-tin of the Cassiterides,[262] or whether the ore was worked by the ‘Welsh of the Horn’—the barbarians of Cornwall and Devonshire, who in those days were probably confined to small coast-clearings.[263] Herodotus, indeed, knows nothing (iii. 115) of ‘any islands called the Cassiterides (tin islands) whence the tin comes.’ These Silures or Scilly Islands were evidently mere depôts, not sites of production. The Phœnicians kept their secret well, and lost their ships rather than betray it; so says Strabo (iii. 5, § 11), whose Cassiterides appear to be the Azores.[264] The age when the trade was first opened is disputed; some place it B.C. 1500, others[265] reduce it to B.C. 400. Diodorus Siculus (v. 21–2) tells us that tin was found and run into pigs near the Belerium Promontory (Land’s End); thence it was carted to Ictis (Vectis, not the Isle of Wight, but Saint Michael’s Mount and Love Island);[266] and lastly horsed across Gaul to the Rhone. There is in the Truro Museum[267] a pig of tin, flat above and reniform below (the shape of the mould), two feet eleven inches by eleven inches broad, with a particular mark; it has been suggested that this is Phœnician. ‘Cassiter Street’ in Bodmin is supposed to retain the classical name. The second Thursday before Christmas Day is called in Cornwall (Kern-Walli, Cornu Galliæ) ‘Picrous Day,’ from the man who discovered the ‘streaming’ (or washing) of ‘stean’ or tin. Strabo gives a bad account of the people of the twelve Cassiterides and their Cornishmen, the latter ‘resembling the Furies we see in tragic representations.’ These pleasant persons would find stream-tin, almost fit for use, lying upon the surface by the side of copper pyrites—the latter harder than tin, but still comparatively soft and ductile. Both ores were easily fused, while iron was comparatively difficult and tedious to smelt; and the two (copper and tin) combined were not only more fusible, but they also continued longer in the fluid state, facilitating casting and moulding. Hence Worsäae believes that England was an ancient centre of bronze, whence the alloy was diffused throughout Europe. It is usually stated that the bronze-using period in England began between B.C. 1400 and 1200, and lasted eight to ten centuries, the invasion of Cæsar taking place during the early ‘Iron Age.’