Under the general title of Coblynau I class the fairies which haunt the mines, quarries and underground regions of Wales, corresponding to the cabalistic Gnomes. The word coblyn has the double meaning of knocker or thumper and sprite or fiend; and may it not be the original of goblin? It is applied by Welsh miners to pigmy fairies which dwell in the mines, and point out, by a peculiar knocking or rapping, rich veins of ore. The faith is extended, in some parts, so as to cover the indication of subterranean treasures generally, in caves and secret places of the mountains. The coblynau are described as being about half a yard in height and very ugly to look upon, but extremely good-natured, and warm friends of the miner. Their dress is a grotesque imitation of the miner's garb, and they carry tiny hammers, picks and lamps. They work busily, loading ore in buckets, flitting about the shafts, turning tiny windlasses, and pounding away like madmen, but really accomplishing nothing whatever. They have been known to throw stones at the miners, when enraged at being lightly spoken of; but the stones are harmless. Nevertheless, all miners of a proper spirit refrain from provoking them, because their presence brings good luck.