The Silver Chair Jill shows off by approaching the edge, and Eustace, trying to pull her back, falls over the edge. Aslan appears and saves Eustace by blowing him to Narnia. He charges Jill with helping Eustace find King Caspian X's son, Prince Rilian of Narnia, who disappeared some years before. He gives Jill four Signs to guide them on their quest and then blows Jill into Narnia, where Eustace is already waiting by a great castle. They watch as an elderly and frail man takes ship and sails from the harbour. To Eustace's dismay, they learn that the departing King is actually
The Chronicles of Narnia by arguing that the astrological associations grew in the writing: A quantitative analysis on the imagery in the different books of "The Chronicles" gives mixed support to Ward's thesis: "The Voyage of the Dawn Treader", "The Silver Chair", "The Horse and His Boy", and "The Magician's Nephew" do indeed employ concepts associated with, respectively, Sol, Luna, Mercury, and Venus, far more often than chance would predict, but "The Lion, the Witch, and the Wardrobe", "Prince Caspian", and "The Last Battle" fall short of statistical correlation with their proposed planets. George MacDonald's "Phantastes" (1858) influenced the structure and setting of "The