A Key is not constituted flat or sharp, by having Flats or Sharps at the Beginning of the Piece of Music; but it depends upon the third Note upwards from that Note in which the Music is composed. For Instance, if the Piece is composed in D, and we find that F is natural, or only half a Note from E, then it is in a flat, or flat third, Key; if F is sharp, or a whole Note above E, then the Piece of Music is composed in a sharp third Key. But as there are so many Books extant about Thorough Bass, which give a full Account of this, it will be needless to say any more about it, only to mention it as an Error, among other Errors. The Reader shall not be tired any more with Music at present, but for Variety we will shift the Scene a little while. * * * * * XII. _That apparitions or Spectres do exist; or that the Ghosts of Men do appear at, before, or after their Deaths._ We would not be thought, in the following Discourse, to call in Question that great Miracle of our Saviour's rising again the third Day, and appearing to the Twelve: What shall be here said, will rather prove the Miracle to be the greater, and therefore more worthy the interfering Hand of Omnipotence. But we must not suppose that the Supreme Being will condescend to pervert the Order of Nature for Individuals. The ancient Heathens had a true Notion of the Greatness of him, _qui Templa Coeli summa sonitu concutit_. Ter. Eun. And Horace observes, _Nec Deus intersit, nisi dignus vindice nodus._ Art. Poet. Since it must be no less than a Miracle which causes an Apparition, I shall proceed, without any Scruple, to prove that there is no such Thing in Nature really existing.