John Varley, astrologer and water-colour painter, was introduced to Blake by Linnell, and it was for him that Blake did the 'visionary heads' described by Allan Cunningham, p. 420 below. 'The Ghost of a Flea' exists in both forms described by Varley, in a sketch of the head (which he reproduces, engraved by Linnell, in a plate at the end of his book, together with two other heads in outline), and in a full-length picture in tempera. The passage which follows is taken from pp. 54, 55 of 'A Treatise on Zodiacal Physiognomy; illustrated with engravings of heads and features; accompanied by tables of the times of rising of the twelve signs of the Zodiac; and containing also new and astrological explanation of some remarkable portions of Ancient Mythological History.' By John Varley. London: Printed for the Author, 1828.]
