A Letter of the Authors: Expounding His Whole Intention in the Course of This Worke: Which for That It Giueth Great Light to the Reader, for the Better Vnderstanding Is Herevnto Annexed. To the Right Noble and Valorous, Sir Walter Raleigh, Knight, Lo: Wardein of the Stanneries, and Her Maiesties Lieutenaunt of the Countie of Cornewayll