In the prefatory advertisement to the First Edition of the Prelude, 1850, it is stated that that poem was designed to be introductory to the Recluse, and that the Recluse, if completed, would have consisted of three parts. The second part is the Excursion. The third part was only planned. The first book of the first part was left in manuscript by Wordsworth. It is now (1888) published for the first time in extenso. (Summary from the Preface)