An Island in the Moon is an incomplete manuscript written in pen and ink in Blake’s hand. It contains the earliest extant drafts of "Nurse’s Song," "Holy Thursday," and "The Little Boy Lost," which make their first published appearance in his Songs of Innocence (1789). Topical allusions and the history of Blake’s associations with the London social circle of the Rev. A. S. Mathew and his wife Harriet in the 1780s suggest a period of composition c. 1784-85. The use of dialogue interspersed with song lyrics links the narrative to both contemporary theatrical forms and broader eighteenth-century satirical traditions. Blake and his brother Robert play central roles as the philosophers “Quid” and “Suction.” Although Blake left it orphaned, untitled, and unfinished in a heavily revised manuscript, Island is in some sense a primary literary experiment for him, setting the undertone of much to follow.