The advent of the Bronze Period, however, cannot be held to have been fairly introduced until the native Caledonian had learned, at least to melt the metals, and to mould the weapons and implements which he used, if not to quarry and smelt the ores which abound in his native hills. The progress consequent on the indirect introduction of the metals would speedily create new wants and the desire for modifications and improvements on the implements of foreign manufacture. The demands on his sagacity and skill would increase with the gradual progress in intelligence and civilisation consequent on the new impulses brought into operation; and thus would the arts of the smith and the jeweller be superinduced on the originally barbarian devices of the Caledonian. Once introduced, by whatever means, he was not slow to improve on the lessons furnished in the novel art; and while, with a pertinacious adherence to ancient models singularly characteristic of primitive races, we find implements and personal ornaments of the modern Scottish Highlander not greatly differing from those of fully ten centuries ago, we also find the natives of isolated districts, beyond the reach of changing influences, practising the ingenious arts of this remote period when every man was his own armourer and goldsmith. It needs not either the authority of revelation, or the demonstrations of ethnology, to prove that God has made of one blood all that dwell upon the earth. Man, placed under the same conditions, everywhere exhibits similar results. The ancient Stone Period of Assyria and Egypt resembles that of its European successor, and that again finds a nearly complete parallel in the primitive remains of the valley of the Mississippi, and in the modern arts of the barbarous Polynesians. So, too, with the higher state which succeeds this. The characteristics of the early Bronze Period are long since familiar to us. Milton, who accords equally stinted honours to Mulciber and to Mammon, by whose suggestion taught, men "Ransack'd the centre, and with impious hands Rifled the bowels of their mother earth For treasures better hid,"-- refers to the introduction of the metallurgic arts as first among those great sources of change which the Archangel Michael makes known to Adam when exhibiting to him the future destiny of his seed. The knowledge of working in metals is there also introduced in contrast to the simpler arts of the pastoral state, and as the chief source of social progress with all its accompanying development of luxury and crime. On one side Adam sees the shepherds' huts and grazing herds;