The poems which follow appeared, with a few exceptions, either in the volumes published from time to time by Shelley himself, or in the "Posthumous Poems" of 1824, or in the "Poetical Works" of 1839, of which a second and enlarged edition was published by Mrs. Shelley in the same year. A few made their first appearance in some fugitive publication—such as Leigh Hunt's "Literary Pocket-Book"—and were subsequently incorporated in the collective editions. In every case the editio princeps and (where this is possible) the exact date of composition are indicated below the title.