The sort of familiar spirit employed by magicians in the eighteenth and preceding centuries was distinctly a demon. The spirit of this class which was controlled by Sir David Llwyd is celebrated in Wales. This Sir David was a famous dealer in the black art, who lived in Cardiganshire. He was a physician, and at one time a curate; but being known to deal in the magic art, he was turned out of the curacy, and obliged to live by practising physic. It was thought he learned the magic art in Oxford. 'It was this man's great wickedness,' says the Prophet Jones, 'to make use of a familiar spirit.... The bishop did well in turning him out of the sacred office, though he was no ill-tempered man, for how unfit was such a man to read the sacred Scripture! With what conscience could he ask the sponsors in baptism to undertake for the child to renounce the world, the flesh and the devil, who himself was familiar with one of the spirits of darkness?... Of this Sir David I have heard much, but chiefly depend upon what was told to me by the Rev. Mr. Thomas Lewis, the curate of Landdw and Tolachdy, an excellent preacher of the gospel; and not sufficiently esteemed by his people, (which likely will bring a judgment on them in time to come.) Mr. Lewis knew the young woman who had been Sir David's maid servant, and the house where he lived.' His familiar spirit he kept locked up in a book. Once while he was in Radnorshire, in going from one house to another he accidentally left this book behind him, and sent his boy back to fetch it. The boy, being of an inquisitive turn of mind, opened the book--a thing his master had expressly charged him not to do--and the familiar spirit immediately demanded to be set at work. The boy, though very much alarmed, had the wit to answer, 'Tafl gerrig o'r afon,' (throw stones out of the river,) which the spirit immediately did, so that the air was for a time full of flying stones, and the boy was fain to skip about in a surprisingly active manner in order to dodge the same. After a while, having thrown up a great quantity of stones out of the river, (the Wye,) the spirit again, with the pertinacity of its kind, asked for something to do; whereupon the boy bade it throw the stones back again, which it did. Sir David having waited a long time for the boy to return, began to suspect that things had gone wrong, and so hastened back after him, and commanded the familiar spirit again into his book.