'She used passages from Defoe's "Tour through the whole island of Great Britain" to prepare her two boys for a visit to Windsor Castle in 1792: "I did it", she wrote, "that they might have their observation raised when we carried them there. There is a great difference between showing and seeing - the one is merely Corporeal the other unites the mental to the bodily powers and lays in a stock of ideas". [reading aloud for didactic purposes].