It is believed that this people understood the art of mining and that they were acquainted with the use of iron. The following is an extract from one of Hamilton's letters on the Antrim coast:
"About the year 1770 the miners, in pushing forward an adit toward the bed of coal, at an unexplored part of the Ballycastle cliff, unexpectedly broke through the rock into a narrow passage, so much contracted and choked up with various drippings and deposits on its sides and bottom, as rendered it impossible for any of the workmen to force through, that they might examine it farther. Two lads were, therefore, made to creep in with candles, for the purpose of exploring this subterranean avenue. They accordingly pressed forward for a considerable time, with much labor and difficulty, and at length entered into an extensive labyrinth branching off into numerous apartments, in the mazes and windings of which they were completely bewildered and lost. After various vain attempts to return, their lights were extinguished, their voices became hoarse, and, becoming wearied and spiritless, they sat down together, in utter despair of an escape from this miserable dungeon. In the meanwhile, the workmen in the adit became alarmed for their safety, fresh hands were incessantly employed, and, in the course of twenty-four hours, the passage was so open as to admit the most active among the miners... On examining this subterranean wonder, it was found to be a complete gallery, which had been driven forward many hundred yards to the bed of coal: that it branched off into numerous chambers, where miners had carried on their different works: that these chambers were dressed in a workmanlike manner: that pillars were left at proper intervals to support the roof. In short it was found to be an extensive mine, wrought by people at least as expert in the business as the present generation. Some remains of the tools, and even of the baskets used in the works, were discovered, but in such a decayed state that, on being touched, they immediately crumbled to pieces. From the remains which were found, there is reason to believe that the people who wrought these collieries anciently, were acquainted with the use of iron, some small pieces of which were found; it appeared as if some of their instruments had been thinly shod with that metal."
Through various means the fact has been ascertained that although in the sixth century the buildings in Ireland were mean and wholly without artistic merit or skilful design, in an earlier age they were magnificent. Of the causes which produced the decay of architecture, the extinction of the arts and sciences, and the general degradation of the people of this island the devotees of St. Paul and of the Romish Church are alike silent.
For ages after the subjection of Ireland, in open defiance of the English, the people continued to dispense justice, and to enforce the old Brehon laws of the country.
The lack of regard shown for English law in Ireland, even as late as the sixteenth century, is set forth by Baron Fingles, who wrote in the time of Henry VIII. He says:
"It is a great abuse and reproach that the laws and statutes made in this land are not observed nor kept after the making of them eight days, while diverse Irishmen cloth abuse and keep such laws and statutes which they make upon hills in this country, firm and stable, without breaking them for any favor or reward."
By a statute of Parliament enacted at Kilkenny, it was made high treason to administer or observe these old Brehon laws. The two enactments especially obnoxious to the English were Gahail Cinne, and Eiric. The former of these enactments was that which in opposition to the English law of primogeniture declared that the estate of a parent should descend in equal proportion to all members of the family. There was another law, or custom, among this people, which provided that the chief of the tribe or people should be elected by general suffrage.
We have something more than a hint of the condition of ancient Ireland and its people in a description given by the Greeks of one of its inhabitants. Abarras, who visited Greece about six hundred years before Christ, and who was called by the Greeks a Hyperborean, was a priest of the Sun, who went abroad for the purpose of study and observation, and to renew by his presence and his gifts the old friendship which had long existed between the Celts and the Greeks. Strabo remarks concerning Abarras that he was much admired by the learned men of Greece. Himerius says of him that he came
"not clad in skins like a Scythian, but with a bow in his hand, and a quiver on his shoulders and a plaid wrapped about his body, a gilded belt encircled his loins, and trousers reaching from his waist downward to the soles of his feet. He was easy in his address, agreeable in conversation, active in dispatch and secret in the management of great affairs; quick in judging of present occurrences, and ready to take his part in any sudden emergency; provident, withal, in guarding against futurity; diligent in quest of wisdom, fond of friendship; trusting very little to fortune; yet having the entire confidence of others, and trusted with everything for his prudence. He spoke Greek with so much fluency that you would have thought that he had been bred or brought up in the Lyceum and had conversed all his life with the Academy of Athens. He had frequent intercourse with Pythagoras whom he astonished by the variety and extent of his knowledge."
From the descriptions given of the native country of Abarras by the Greeks, it is evident that it could have been none other than Ireland.