Beneath the dolmens of Roknia (Algeria) were found thirteen bronze ornaments, and two in silver gilt of very superior workmanship, and under those of the Caucasus were picked up blue-glass beads, arrow-heads, and bronze rings; but M. Chantre, who is an authority in the matter, thinks these objects date from interments subsequent to the erection of the dolmens. Iron was much more rarely used than bronze in the greater part of Europe. It was not even known in Scandinavia before the Christian era. In Germany, Pannonia, and Noricum its use dates from the sixth or seventh century B.C. Beneath the mounds of Central America we find but a few fragments of meteoric iron, the rarity of which made them extremely valuable; on the other hand iron was known to the Hellenes as long ago as the fourteenth century B.C., and it had been employed in Egypt for many centuries prior to that time. The most ancient sepulchres of Malabar contain iron tridents, and Genesius dates their use from before the deluge. It is therefore surprising to find that some races remained for an illimitable time ignorant of the way to procure a metal of such great utility. Iron was not used in Brittany until towards the close of the period during which megalithic monuments were erected. Stone, bronze, and iron were found together in the Nignol tomb at Carnac, which dates from the time when cremation was already practised. We find the same association of different materials in the Rocher dolmen. In the British Isles, especially in Scotland and in Ireland, bronze and iron objects are more numerous than in France. At Aspatria, near St. Bees in Cumberland, a cist was discovered containing the skeleton of a man measuring seven feet from the crown of the head to the feet. Near the giant lay numerous valuable objects, including an iron sword inlaid with silver, a gold buckle, the fragments of a shield and of a battle-axe, and the iron bit of a snaffle bridle. The great cairn of Dowth, in Ireland, contained iron knives and rings mixed with bone needles, copper pins, and glass and amber beads, all showing rapid progress in the industrial arts. The remarkable cairns near Lough Crew (Ireland), which were untouched and indeed unknown to archæologists until 1863, were found to contain, amongst many other interesting objects, numerous human bones, fragments of pottery, shells of marine mollusca, 4,884 bone implements, and seven pieces of iron very much oxidized. The tumuli of the Grand Duchy of Posen and those of Prussia cover kistvaens containing funeral vases, weapons, and silver and gold ornaments.